wbtl_file Class Reference

Implementation of file based on buffered writes and block remapping via a translation layer. More...

#include <wbtl_file.h>

Inheritance diagram for wbtl_file:

Collaboration diagram for wbtl_file:

Public Member Functions
	wbtl_file (file *backend_file, size_type write_buffer_size, int write_buffers=2, int queue_id=DEFAULT_QUEUE, int allocator_id=NO_ALLOCATOR)
	constructs file object More...
offset_type	size ()
	Returns size of the file. More...
void	set_size (offset_type newsize)
void	lock ()
	Locks file for reading and writing (acquires a lock in the file system) More...
void	serve (const request *req) throw (io_error)
void	discard (offset_type offset, offset_type size)
const char *	io_type () const
	Identifies the type of I/O implementation. More...
Public Member Functions inherited from disk_queued_file
	disk_queued_file (int queue_id, int allocator_id)
request_ptr	aread (void *buffer, offset_type pos, size_type bytes, const completion_handler &on_cmpl)
	Schedules an asynchronous read request to the file. More...
request_ptr	awrite (void *buffer, offset_type pos, size_type bytes, const completion_handler &on_cmpl)
	Schedules an asynchronous write request to the file. More...
virtual int	get_queue_id () const
	Returns the identifier of the file's queue. More...
virtual int	get_allocator_id () const
	Returns the file's allocator. More...
Public Member Functions inherited from file
void	add_request_ref ()
void	delete_request_ref ()
int	get_request_nref ()
virtual void	set_size (offset_type newsize)=0
	Changes the size of the file. More...
virtual int	get_physical_device_id () const
virtual void	discard (offset_type offset, offset_type size)
	Discard a region of the file (mark it unused) some specialized file types may need to know freed regions. More...
virtual void	export_files (offset_type offset, offset_type length, std::string prefix)
virtual void	remove ()

Protected Member Functions
void	sread (void *buffer, offset_type offset, size_type bytes)
void	swrite (void *buffer, offset_type offset, size_type bytes)
offset_type	get_next_write_block ()
void	check_corruption (offset_type region_pos, offset_type region_size, sortseq::iterator pred, sortseq::iterator succ)
Protected Member Functions inherited from file
	file ()
	Initializes file object. More...

Additional Inherited Members
Public Types inherited from file
enum	open_mode {   RDONLY = 1, WRONLY = 2, RDWR = 4, CREAT = 8,   DIRECT = 16, TRUNC = 32, SYNC = 64, NO_LOCK = 128 }
	Definition of acceptable file open modes. More...
typedef request::offset_type	offset_type
typedef request::size_type	size_type
Static Public Attributes inherited from file
static const int	DEFAULT_QUEUE = -1
static const int	NO_QUEUE = -2
static const int	NO_ALLOCATOR = -1

Detailed Description

Implementation of file based on buffered writes and block remapping via a translation layer.

Constructor & Destructor Documentation

wbtl_file::wbtl_file	(	file *	backend_file,
		size_type	write_buffer_size,
		int	write_buffers = 2,
		int	queue_id = DEFAULT_QUEUE,
		int	allocator_id = NO_ALLOCATOR
	)

constructs file object

Parameters

backend_file	file object used as storage backend, will be deleted in ~wbtl_file()
disk	disk(file) identifier

Member Function Documentation

const char* wbtl_file::io_type ( ) const

virtual

Identifies the type of I/O implementation.

Returns

pointer to null terminated string of characters, containing the name of I/O implementation

Reimplemented from file.

void wbtl_file::lock ( )

virtual

Locks file for reading and writing (acquires a lock in the file system)

Implements file.

offset_type wbtl_file::size ( )

virtual

Returns size of the file.

Returns

file size in bytes

Implements file.

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

• wbtl_file.h