mongo::LogFile Class Reference

#include <logfile.h>

Public Member Functions
	LogFile (const std::string &name, bool readwrite=false)
	create the file and open. More...
	~LogFile ()
	closes More...
void	synchronousAppend (const void *buf, size_t len)
	append to file. More...
void	writeAt (unsigned long long offset, const void *_bug, size_t _len)
	write at specified offset. More...
void	readAt (unsigned long long offset, void *_buf, size_t _len)
void	truncate ()

Public Attributes
const std::string	_name

Private Types
typedef int	fd_type

Private Attributes
const size_t	minDirectIOSizeBytes = 4096
fd_type	_fd
bool	_direct
size_t	_blkSize

Member Typedef Documentation

fd_type

typedef int mongo::LogFile::fd_type

private

Constructor & Destructor Documentation

LogFile()

mongo::LogFile::LogFile	(	const std::string &	name,
		bool	readwrite = false
	)

create the file and open.

must not already exist. throws UserAssertion on i/o error

~LogFile()

mongo::LogFile::~LogFile

(

)

closes

Member Function Documentation

readAt()

void mongo::LogFile::readAt	(	unsigned long long	offset,
		void *	_buf,
		size_t	_len
	)

synchronousAppend()

void mongo::LogFile::synchronousAppend	(	const void *	buf,
		size_t	len
	)

append to file.

does not return until sync'd. uses direct i/o when possible. throws UserAssertion on an i/o error note direct i/o may have alignment requirements

truncate()

void mongo::LogFile::truncate

(

)

writeAt()

void mongo::LogFile::writeAt	(	unsigned long long	offset,
		const void *	_bug,
		size_t	_len
	)

write at specified offset.

must be aligned. noreturn until physically written. thread safe

Member Data Documentation

_blkSize

size_t mongo::LogFile::_blkSize

private

_direct

bool mongo::LogFile::_direct

private

_fd

fd_type mongo::LogFile::_fd

private

_name

const std::string mongo::LogFile::_name

minDirectIOSizeBytes

const size_t mongo::LogFile::minDirectIOSizeBytes = 4096

private

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The documentation for this class was generated from the following files:

• /home/louis/git/mongodbsource.github.io/src/src/mongo/db/storage/mmap_v1/logfile.h
• /home/louis/git/mongodbsource.github.io/src/src/mongo/db/storage/mmap_v1/logfile.cpp