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syscall_file Class Referencefinal

Detailed Description

Implementation of file based on UNIX syscalls.

Definition at line 30 of file syscall_file.hpp.

+ Inheritance diagram for syscall_file:
+ Collaboration diagram for syscall_file:

#include <syscall_file.hpp>

Public Member Functions

 syscall_file (const std::string &filename, int mode, int queue_id=DEFAULT_QUEUE, int allocator_id=NO_ALLOCATOR, unsigned int device_id=DEFAULT_DEVICE_ID, file_stats *file_stats=nullptr)
const char * io_type () const final
void serve (void *buffer, offset_type offset, size_type bytes, request::read_or_write op) final
- Public Member Functions inherited from ufs_file_base
 ~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...
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)
unsigned int get_device_id () const
 Returns the file's physical device id. More...
file_statsget_file_stats () const
size_t get_request_nref ()
 return number of referenced requests More...
bool need_alignment () const
 Returns need_alignment_. More...
fileoperator= (const file &)=delete
 non-copyable: delete assignment operator More...
fileoperator= (file &&)=default
 move-assignment operator: default More...
- 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...
ReferenceCounteroperator= (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...
- 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_complete=completion_handler()) override
request_ptr awrite (void *buffer, offset_type pos, size_type bytes, const completion_handler &on_complete=completion_handler()) override
int get_allocator_id () const override
 Returns the file's parallel disk block allocator number. More...
int get_queue_id () const override

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,
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
- Protected Member Functions inherited from ufs_file_base
 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 inherited from ufs_file_base
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_
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...

Constructor & Destructor Documentation

syscall_file ( const std::string &  filename,
int  mode,
int  queue_id = DEFAULT_QUEUE,
int  allocator_id = NO_ALLOCATOR,
unsigned int  device_id = DEFAULT_DEVICE_ID,
file_stats file_stats = nullptr 

Constructs file object.

filenamepath of file
modeopen mode, see foxxll::file::open_modes
queue_iddisk queue identifier
allocator_idlinked disk_allocator
device_idphysical device identifier
file_statsfile-specific stats

Definition at line 40 of file syscall_file.hpp.

Member Function Documentation

const char * io_type ( ) const

Identifies the type of I/O implementation.

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

Implements file.

Definition at line 120 of file syscall_file.cpp.

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