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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/**
******************************************************************************
* @author Oivind H. Danielsen
* @date Creation date: 2000-09-21
* @file
* Class definition for FastOS_Linux_File.
*****************************************************************************/
#pragma once
#include <vespa/fastos/unix_file.h>
/**
* This is the Linux implementation of @ref FastOS_File. Most
* methods are inherited from @ref FastOS_UNIX_File.
*/
class FastOS_Linux_File : public FastOS_UNIX_File
{
public:
using FastOS_UNIX_File::ReadBuf;
protected:
int64_t _cachedSize;
int64_t _filePointer; // Only maintained/used in directio mode
public:
FastOS_Linux_File (const char *filename = NULL);
virtual ~FastOS_Linux_File () {
Close();
}
virtual bool
GetDirectIORestrictions(size_t &memoryAlignment,
size_t &transferGranularity,
size_t &transferMaximum);
virtual bool
DirectIOPadding(int64_t offset, size_t length,
size_t &padBefore,
size_t &padAfter);
virtual void
EnableDirectIO(void);
virtual bool
SetPosition(int64_t desiredPosition);
virtual int64_t
GetPosition(void);
virtual bool
SetSize(int64_t newSize);
virtual void
ReadBuf(void *buffer, size_t length, int64_t readOffset);
virtual void *
AllocateDirectIOBuffer(size_t byteSize, void *&realPtr);
static void *
allocateGenericDirectIOBuffer(size_t byteSize,
void *&realPtr);
static size_t
getMaxDirectIOMemAlign(void);
virtual ssize_t
Read(void *buffer, size_t len);
virtual ssize_t
Write2(const void *buffer, size_t len);
virtual bool
Open(unsigned int openFlags, const char *filename = NULL);
static bool
InitializeClass(void);
private:
ssize_t
readUnalignedEnd(void *buffer, size_t length, int64_t readOffset);
ssize_t
writeUnalignedEnd(const void *buffer, size_t length, int64_t readOffset);
ssize_t
ReadBufInternal(void *buffer, size_t length, int64_t readOffset);
ssize_t
readInternal(int fh, void *buffer, size_t length, int64_t readOffset);
ssize_t
readInternal(int fh, void *buffer, size_t length);
ssize_t
writeInternal(int fh, const void *buffer, size_t length,
int64_t writeOffset);
ssize_t
writeInternal(int fh, const void *buffer, size_t length);
static const size_t _directIOFileAlign;
static const size_t _directIOMemAlign;
static const size_t _pageSize;
};
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