Base for UNIX file system implementations. More...

Inheritance diagram for ufs_file_base:

Collaboration diagram for ufs_file_base:

Public Member Functions
offset_type	size ()
	Returns size of the file.
void	set_size (offset_type newsize)
	Changes the size of the file.
void	lock ()
	Locks file for reading and writing (acquires a lock in the file system)
const char *	io_type () const
	Identifies the type of I/O implementation.
void	remove ()
Public Member Functions inherited from file
virtual request_ptr	aread (void *buffer, offset_type pos, size_type bytes, const completion_handler &on_cmpl)=0
	Schedules an asynchronous read request to the file.
virtual request_ptr	awrite (void *buffer, offset_type pos, size_type bytes, const completion_handler &on_cmpl)=0
	Schedules an asynchronous write request to the file.
virtual void	serve (const request *req)=0 throw (io_error)
void	add_request_ref ()
void	delete_request_ref ()
int	get_request_nref ()
virtual int	get_queue_id () const =0
	Returns the identifier of the file's queue.
virtual int	get_allocator_id () const =0
	Returns the file's allocator.
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.
virtual void	export_files (offset_type offset, offset_type length, std::string prefix)

Protected Member Functions
	ufs_file_base (const std::string &filename, int mode)
offset_type	_size ()
void	close ()
Protected Member Functions inherited from file
	file ()
	Initializes file object.

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

Base for UNIX file system implementations.

Member Function Documentation

__STXXL_BEGIN_NAMESPACE const char * ufs_file_base::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 ufs_file_base::lock ( )

virtual

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

Implements file.

void ufs_file_base::set_size ( offset_type newsize )

virtual

Changes the size of the file.

Parameters:

newsize new file size

Implements file.

Reimplemented in sim_disk_file.

file::offset_type ufs_file_base::size ( )

virtual

Returns size of the file.

Implements file.

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