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/** $Id: VDIoBackend.cpp $ */
/** @file
*
* VBox HDD container test utility, I/O backend API
*/
/*
* Copyright (C) 2013 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.
*/
#define LOGGROUP LOGGROUP_DEFAULT /** @todo: Log group */
#include <iprt/err.h>
#include <iprt/log.h>
#include <iprt/assert.h>
#include <iprt/asm.h>
#include <iprt/mem.h>
#include <iprt/file.h>
#include <iprt/aiomgr.h>
#include <iprt/string.h>
#include "VDIoBackend.h"
#include "VDMemDisk.h"
#include "VDIoBackendMem.h"
typedef struct VDIOBACKEND
{
/** Memory I/O backend handle. */
PVDIOBACKENDMEM pIoMem;
/** Async I/O manager. */
RTAIOMGR hAioMgr;
/** Users of the memory backend. */
volatile uint32_t cRefsIoMem;
/** Users of the file backend. */
volatile uint32_t cRefsFile;
} VDIOBACKEND;
typedef struct VDIOSTORAGE
{
/** Pointer to the I/O backend parent. */
PVDIOBACKEND pIoBackend;
/** Completion callback. */
PFNVDIOCOMPLETE pfnComplete;
/** Flag whether this storage is backed by a file or memory.disk. */
bool fMemory;
/** Type dependent data. */
union
{
/** Memory disk handle. */
PVDMEMDISK pMemDisk;
struct
{
/** file handle. */
RTFILE hFile;
/** I/O manager file handle. */
RTAIOMGRFILE hAioMgrFile;
} File;
} u;
} VDIOSTORAGE;
static DECLCALLBACK(void) vdIoBackendFileIoComplete(RTAIOMGRFILE hAioMgrFile, int rcReq, void *pvUser)
{
PVDIOSTORAGE pIoStorage = (PVDIOSTORAGE)RTAioMgrFileGetUser(hAioMgrFile);
pIoStorage->pfnComplete(pvUser, rcReq);
}
int VDIoBackendCreate(PPVDIOBACKEND ppIoBackend)
{
int rc = VINF_SUCCESS;
PVDIOBACKEND pIoBackend;
pIoBackend = (PVDIOBACKEND)RTMemAllocZ(sizeof(VDIOBACKEND));
if (pIoBackend)
{
pIoBackend->hAioMgr = NIL_RTAIOMGR;
*ppIoBackend = pIoBackend;
}
else
rc = VERR_NO_MEMORY;
return rc;
}
void VDIoBackendDestroy(PVDIOBACKEND pIoBackend)
{
if (pIoBackend->pIoMem)
VDIoBackendMemDestroy(pIoBackend->pIoMem);
if (pIoBackend->hAioMgr)
RTAioMgrRelease(pIoBackend->hAioMgr);
RTMemFree(pIoBackend);
}
int VDIoBackendStorageCreate(PVDIOBACKEND pIoBackend, const char *pszBackend,
const char *pszName, PFNVDIOCOMPLETE pfnComplete,
PPVDIOSTORAGE ppIoStorage)
{
int rc = VINF_SUCCESS;
PVDIOSTORAGE pIoStorage = (PVDIOSTORAGE)RTMemAllocZ(sizeof(VDIOSTORAGE));
if (pIoStorage)
{
pIoStorage->pIoBackend = pIoBackend;
pIoStorage->pfnComplete = pfnComplete;
if (!strcmp(pszBackend, "memory"))
{
pIoStorage->fMemory = true;
rc = VDMemDiskCreate(&pIoStorage->u.pMemDisk, 0 /* Growing */);
if (RT_SUCCESS(rc))
{
uint32_t cRefs = ASMAtomicIncU32(&pIoBackend->cRefsIoMem);
if ( cRefs == 1
&& !pIoBackend->pIoMem)
{
rc = VDIoBackendMemCreate(&pIoBackend->pIoMem);
if (RT_FAILURE(rc))
VDMemDiskDestroy(pIoStorage->u.pMemDisk);
}
}
}
else if (!strcmp(pszBackend, "file"))
{
pIoStorage->fMemory = false;
uint32_t cRefs = ASMAtomicIncU32(&pIoBackend->cRefsFile);
if ( cRefs == 1
&& pIoBackend->hAioMgr == NIL_RTAIOMGR)
rc = RTAioMgrCreate(&pIoBackend->hAioMgr, 1024);
if (RT_SUCCESS(rc))
{
/* Create file. */
rc = RTFileOpen(&pIoStorage->u.File.hFile, pszName,
RTFILE_O_READWRITE | RTFILE_O_CREATE | RTFILE_O_ASYNC_IO | RTFILE_O_NO_CACHE | RTFILE_O_DENY_NONE);
if (RT_SUCCESS(rc))
{
/* Create file handle for I/O manager. */
rc = RTAioMgrFileCreate(pIoBackend->hAioMgr, pIoStorage->u.File.hFile,
vdIoBackendFileIoComplete, pIoStorage,
&pIoStorage->u.File.hAioMgrFile);
if (RT_FAILURE(rc))
RTFileClose(pIoStorage->u.File.hFile);
}
}
if (RT_FAILURE(rc))
ASMAtomicDecU32(&pIoBackend->cRefsFile);
}
else
rc = VERR_NOT_SUPPORTED;
if (RT_FAILURE(rc))
RTMemFree(pIoStorage);
else
*ppIoStorage = pIoStorage;
}
else
rc = VERR_NO_MEMORY;
return rc;
}
void VDIoBackendStorageDestroy(PVDIOSTORAGE pIoStorage)
{
if (pIoStorage->fMemory)
{
VDMemDiskDestroy(pIoStorage->u.pMemDisk);
ASMAtomicDecU32(&pIoStorage->pIoBackend->cRefsIoMem);
}
else
{
RTAioMgrFileRelease(pIoStorage->u.File.hAioMgrFile);
RTFileClose(pIoStorage->u.File.hFile);
ASMAtomicDecU32(&pIoStorage->pIoBackend->cRefsFile);
}
RTMemFree(pIoStorage);
}
int VDIoBackendTransfer(PVDIOSTORAGE pIoStorage, VDIOTXDIR enmTxDir, uint64_t off,
size_t cbTransfer, PRTSGBUF pSgBuf, void *pvUser, bool fSync)
{
int rc = VINF_SUCCESS;
if (pIoStorage->fMemory)
{
if (!fSync)
{
rc = VDIoBackendMemTransfer(pIoStorage->pIoBackend->pIoMem, pIoStorage->u.pMemDisk,
enmTxDir, off, cbTransfer, pSgBuf, pIoStorage->pfnComplete,
pvUser);
}
else
{
switch (enmTxDir)
{
case VDIOTXDIR_READ:
rc = VDMemDiskRead(pIoStorage->u.pMemDisk, off, cbTransfer, pSgBuf);
break;
case VDIOTXDIR_WRITE:
rc = VDMemDiskWrite(pIoStorage->u.pMemDisk, off, cbTransfer, pSgBuf);
break;
case VDIOTXDIR_FLUSH:
break;
default:
AssertMsgFailed(("Invalid transfer type %d\n", enmTxDir));
}
}
}
else
{
if (!fSync)
{
switch (enmTxDir)
{
case VDIOTXDIR_READ:
rc = RTAioMgrFileRead(pIoStorage->u.File.hAioMgrFile, off, pSgBuf, cbTransfer, pvUser);
break;
case VDIOTXDIR_WRITE:
rc = RTAioMgrFileWrite(pIoStorage->u.File.hAioMgrFile, off, pSgBuf, cbTransfer, pvUser);
break;
case VDIOTXDIR_FLUSH:
rc = RTAioMgrFileFlush(pIoStorage->u.File.hAioMgrFile, pvUser);
break;
default:
AssertMsgFailed(("Invalid transfer type %d\n", enmTxDir));
}
if (rc == VERR_FILE_AIO_IN_PROGRESS)
rc = VINF_SUCCESS;
}
else
{
switch (enmTxDir)
{
case VDIOTXDIR_READ:
rc = RTFileSgReadAt(pIoStorage->u.File.hFile, off, pSgBuf, cbTransfer, NULL);
break;
case VDIOTXDIR_WRITE:
rc = RTFileSgWriteAt(pIoStorage->u.File.hFile, off, pSgBuf, cbTransfer, NULL);
break;
case VDIOTXDIR_FLUSH:
rc = RTFileFlush(pIoStorage->u.File.hFile);
break;
default:
AssertMsgFailed(("Invalid transfer type %d\n", enmTxDir));
}
}
}
return rc;
}
int VDIoBackendStorageSetSize(PVDIOSTORAGE pIoStorage, uint64_t cbSize)
{
int rc = VINF_SUCCESS;
if (pIoStorage->fMemory)
{
rc = VDMemDiskSetSize(pIoStorage->u.pMemDisk, cbSize);
}
else
rc = RTFileSetSize(pIoStorage->u.File.hFile, cbSize);
return rc;
}
int VDIoBackendStorageGetSize(PVDIOSTORAGE pIoStorage, uint64_t *pcbSize)
{
int rc = VINF_SUCCESS;
if (pIoStorage->fMemory)
{
rc = VDMemDiskGetSize(pIoStorage->u.pMemDisk, pcbSize);
}
else
rc = RTFileGetSize(pIoStorage->u.File.hFile, pcbSize);
return rc;
}
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