Detailed Description

Base for UNIX file system implementations.

Definition at line 32 of file ufs_file_base.hpp.

Inheritance diagram for ufs_file_base:

Collaboration diagram for ufs_file_base:

#include <ufs_file_base.hpp>

Public Member Functions
	~ufs_file_base ()

void	close_remove () final
	close and remove file More...

const char *	io_type () const override

bool	is_device () const
	return true if file is special device node More...

void	lock () final
	Locks file for reading and writing (acquires a lock in the file system). More...

void	set_size (offset_type newsize) final

offset_type	size () final

void	unlink ()
	unlink file without closing it. More...

Public Member Functions inherited from file
	file (unsigned int device_id=DEFAULT_DEVICE_ID, file_stats *file_stats=nullptr)
	Construct a new file, usually called by a subclass. More...

	file (const file &)=delete
	non-copyable: delete copy-constructor More...

	file (file &&)=default
	move-constructor: default More...

virtual	~file ()

void	add_request_ref ()
	increment referenced requests More...

virtual request_ptr	aread (void *buffer, offset_type pos, size_type bytes, const completion_handler &on_complete=completion_handler())=0

virtual request_ptr	awrite (void *buffer, offset_type pos, size_type bytes, const completion_handler &on_complete=completion_handler())=0

void	delete_request_ref ()
	decrement referenced requests More...

virtual void	discard (offset_type offset, offset_type size)

virtual void	export_files (offset_type offset, offset_type length, std::string prefix)

virtual int	get_allocator_id () const =0
	Returns the file's parallel disk block allocator number. More...

unsigned int	get_device_id () const
	Returns the file's physical device id. More...

file_stats *	get_file_stats () const

virtual int	get_queue_id () const =0

size_t	get_request_nref ()
	return number of referenced requests More...

bool	need_alignment () const
	Returns need_alignment_. More...

file &	operator= (const file &)=delete
	non-copyable: delete assignment operator More...

file &	operator= (file &&)=default
	move-assignment operator: default More...

virtual void	serve (void *buffer, offset_type offset, size_type bytes, request::read_or_write op)=0

Public Member Functions inherited from ReferenceCounter
	ReferenceCounter () noexcept
	new objects have zero reference count More...

	ReferenceCounter (const ReferenceCounter &) noexcept
	coping still creates a new object with zero reference count More...

	~ReferenceCounter ()

bool	dec_reference () const noexcept
	Call whenever resetting (i.e. More...

void	inc_reference () const noexcept
	Call whenever setting a pointer to the object. More...

ReferenceCounter &	operator= (const ReferenceCounter &) noexcept
	assignment operator, leaves pointers unchanged More...

size_t	reference_count () const noexcept
	Return the number of references to this object (for debugging) More...

bool	unique () const noexcept
	Test if the ReferenceCounter is referenced by only one CountingPtr. More...

Protected Member Functions
	ufs_file_base (const std::string &filename, int mode)

void	_after_open ()

void	_set_size (offset_type newsize)

offset_type	_size ()

void	close ()

Protected Attributes
std::mutex	fd_mutex_

int	file_des_

const std::string	filename_

bool	is_device_
	is special device node More...

int	mode_

Protected Attributes inherited from file
unsigned int	device_id_

file_stats *	file_stats_

bool	need_alignment_ = false
	Flag whether read/write operations REQUIRE alignment. More...

tlx::reference_counter	request_ref_
	count the number of requests referencing this file More...

Additional Inherited Members
Public Types inherited from file
using	offset_type = request::offset_type
	the offset of a request, also the size of the file More...

enum	open_mode { RDONLY = 1, WRONLY = 2, RDWR = 4, CREAT = 8, DIRECT = 16, TRUNC = 32, SYNC = 64, NO_LOCK = 128, REQUIRE_DIRECT = 256 }

using	size_type = request::size_type
	the size of a request More...

Static Public Member Functions inherited from file
static int	unlink (const char *path)
	unlink path from filesystem More...

static int	truncate (const char *path, external_size_type length)

Static Public Attributes inherited from file
static const unsigned int	DEFAULT_DEVICE_ID = std::numeric_limits<unsigned int>::max()

static const int	DEFAULT_LINUXAIO_QUEUE = -2

static const int	DEFAULT_QUEUE = -1

static const int	NO_ALLOCATOR = -1