* Copyright 2007, Ingo Weinhold, ingo_weinhold@gmx.de.
* Copyright 2019-2024, Haiku, Inc. All rights reserved.
* Distributed under the terms of the MIT license.
*/
#ifndef DATA_CONTAINER_H
#define DATA_CONTAINER_H
#include <OS.h>
struct vm_page;
class VMCache;
class AllocationInfo;
class Volume;
class DataContainer {
public:
DataContainer(Volume *volume);
virtual ~DataContainer();
status_t InitCheck() const;
Volume *GetVolume() const { return fVolume; }
status_t Resize(off_t newSize);
off_t GetSize() const { return fSize; }
VMCache* GetCache(struct vnode* vnode);
virtual status_t ReadAt(off_t offset, void *buffer, size_t size,
size_t *bytesRead);
virtual status_t WriteAt(off_t offset, const void *buffer, size_t size,
size_t *bytesWritten);
void GetAllocationInfo(AllocationInfo &info);
private:
inline bool _RequiresCacheMode(size_t size);
inline bool _IsCacheMode() const;
status_t _SwitchToCacheMode();
status_t _DoCacheIO(off_t offset, uint8* buffer, ssize_t length,
size_t* bytesProcessed, bool isWrite, bool retriesAllowed = true);
inline int32 _CountBlocks() const;
private:
Volume *fVolume;
off_t fSize;
VMCache* fCache;
uint8* fSmallBuffer;
off_t fSmallBufferSize;
};
#endif
