* Copyright 2008-2011, Ingo Weinhold, ingo_weinhold@gmx.de.
* Copyright 2004-2007, Axel Dörfler, axeld@pinc-software.de.
* Distributed under the terms of the MIT License.
*
* Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
* Distributed under the terms of the NewOS License.
*/
#ifndef _KERNEL_VM_STORE_ANONYMOUS_NO_SWAP_H
#define _KERNEL_VM_STORE_ANONYMOUS_NO_SWAP_H
#include <vm/VMCache.h>
class VMAnonymousNoSwapCache : public VMCache {
public:
virtual ~VMAnonymousNoSwapCache();
status_t Init(bool canOvercommit,
int32 numPrecommittedPages,
int32 numGuardPages,
uint32 allocationFlags);
virtual status_t Adopt(VMCache* source, off_t offset, off_t size,
off_t newOffset);
virtual ssize_t Discard(off_t offset, off_t size);
virtual bool CanOvercommit();
virtual status_t Commit(off_t size, int priority);
virtual bool StoreHasPage(off_t offset);
virtual int32 GuardSize() { return fGuardedSize; }
virtual void SetGuardSize(int32 guardSize)
{ fGuardedSize = guardSize; }
virtual status_t Read(off_t offset, const generic_io_vec *vecs,
size_t count,uint32 flags,
generic_size_t *_numBytes);
virtual status_t Write(off_t offset, const generic_io_vec *vecs,
size_t count, uint32 flags,
generic_size_t *_numBytes);
virtual status_t Fault(struct VMAddressSpace* aspace,
off_t offset);
virtual void Merge(VMCache* source);
protected:
virtual void DeleteObject();
private:
bool fCanOvercommit;
bool fHasPrecommitted;
uint8 fPrecommittedPages;
int32 fGuardedSize;
};
#endif
