RTEMS File System Directory Support. More...

#include <dirent.h>
#include <rtems/libio_.h>
#include <rtems/rfs/rtems-rfs-data.h>
#include <rtems/rfs/rtems-rfs-file-system.h>
#include <rtems/rfs/rtems-rfs-inode.h>

Macros
#define	RTEMS_RFS_DIR_ENTRY_INO (0)

#define	RTEMS_RFS_DIR_ENTRY_HASH (4)

#define	RTEMS_RFS_DIR_ENTRY_LEN (8)

#define	RTEMS_RFS_DIR_ENTRY_SIZE (4 + 4 + 2)

#define	RTEMS_RFS_DIR_ENTRY_EMPTY (0xffff)

#define	rtems_rfs_dir_entry_hash(_e) rtems_rfs_read_u32 (_e + RTEMS_RFS_DIR_ENTRY_HASH)

#define	rtems_rfs_dir_set_entry_hash(_e, _h) rtems_rfs_write_u32 (_e + RTEMS_RFS_DIR_ENTRY_HASH, _h)

#define	rtems_rfs_dir_entry_ino(_e) rtems_rfs_read_u32 (_e + RTEMS_RFS_DIR_ENTRY_INO)

#define	rtems_rfs_dir_set_entry_ino(_e, _i) rtems_rfs_write_u32 (_e + RTEMS_RFS_DIR_ENTRY_INO, _i)

#define	rtems_rfs_dir_entry_length(_e) rtems_rfs_read_u16 (_e + RTEMS_RFS_DIR_ENTRY_LEN)

#define	rtems_rfs_dir_set_entry_length(_e, _l) rtems_rfs_write_u16 (_e + RTEMS_RFS_DIR_ENTRY_LEN, _l)

Functions
int	rtems_rfs_dir_lookup_ino (rtems_rfs_file_system fs, rtems_rfs_inode_handle inode, const char name, int length, rtems_rfs_ino ino, uint32_t *offset)

int	rtems_rfs_dir_add_entry (rtems_rfs_file_system fs, rtems_rfs_inode_handle dir, const char *name, size_t length, rtems_rfs_ino ino)

int	rtems_rfs_dir_del_entry (rtems_rfs_file_system fs, rtems_rfs_inode_handle dir, rtems_rfs_ino ino, uint32_t offset)

int	rtems_rfs_dir_read (rtems_rfs_file_system fs, rtems_rfs_inode_handle dir, rtems_rfs_pos_rel offset, struct dirent dirent, size_t length)

int	rtems_rfs_dir_empty (rtems_rfs_file_system fs, rtems_rfs_inode_handle dir)

Detailed Description

RTEMS File System Directory Support.

RTEMS File System Directory Support

This file provides the directory support functions.

Macro Definition Documentation

◆ RTEMS_RFS_DIR_ENTRY_EMPTY

#define RTEMS_RFS_DIR_ENTRY_EMPTY (0xffff)

The length when the remainder of the directory block is empty.

◆ RTEMS_RFS_DIR_ENTRY_HASH

#define RTEMS_RFS_DIR_ENTRY_HASH (4)

The hash offset in a directory entry. The hash is 32bits. We need at least 16bits and given the length and ino field are 4 the extra 2 bytes is not a big overhead.

◆ rtems_rfs_dir_entry_hash

#define rtems_rfs_dir_entry_hash ( _e ) rtems_rfs_read_u32 (_e + RTEMS_RFS_DIR_ENTRY_HASH)

Return the hash of the entry.

Parameters

[in] _e is a pointer to the directory entry.

Return values

hash	The uint32_t hash of the entry.

◆ RTEMS_RFS_DIR_ENTRY_INO

#define RTEMS_RFS_DIR_ENTRY_INO (0)

Define the offsets of the fields of a directory entry.The ino offset in a directory entry.

◆ rtems_rfs_dir_entry_ino

#define rtems_rfs_dir_entry_ino ( _e ) rtems_rfs_read_u32 (_e + RTEMS_RFS_DIR_ENTRY_INO)

Return the ino of the entry.

Parameters

[in] _e is a pointer to the directory entry.

Return values

ino	The ino of the entry.

◆ RTEMS_RFS_DIR_ENTRY_LEN

#define RTEMS_RFS_DIR_ENTRY_LEN (8)

The length offset in a directory entry.

◆ rtems_rfs_dir_entry_length

#define rtems_rfs_dir_entry_length ( _e ) rtems_rfs_read_u16 (_e + RTEMS_RFS_DIR_ENTRY_LEN)

Return the length of the entry.

Parameters

[in] _e Pointer to the directory entry.

Return values

length The length of the entry.

◆ RTEMS_RFS_DIR_ENTRY_SIZE

#define RTEMS_RFS_DIR_ENTRY_SIZE (4 + 4 + 2)

The length of the directory entry header.

◆ rtems_rfs_dir_set_entry_hash

#define rtems_rfs_dir_set_entry_hash	(	_e,
		_h
	)	rtems_rfs_write_u32 (_e + RTEMS_RFS_DIR_ENTRY_HASH, _h)

Set the hash of the entry.

Parameters

[in]	_e	is a pointer to the directory entry.
[in]	_h	is the hash of the entry.

◆ rtems_rfs_dir_set_entry_ino

#define rtems_rfs_dir_set_entry_ino	(	_e,
		_i
	)	rtems_rfs_write_u32 (_e + RTEMS_RFS_DIR_ENTRY_INO, _i)

Set the ino of the entry.

Parameters

[in]	_e	is a pointer to the directory entry.
[in]	_i	is the ino of the entry.

◆ rtems_rfs_dir_set_entry_length

#define rtems_rfs_dir_set_entry_length	(	_e,
		_l
	)	rtems_rfs_write_u16 (_e + RTEMS_RFS_DIR_ENTRY_LEN, _l)

Set the length of the entry.

Parameters

[in]	_e	is a pointer to the directory entry.
[in]	_l	is the length.

Function Documentation

◆ rtems_rfs_dir_add_entry()

int rtems_rfs_dir_add_entry	(	rtems_rfs_file_system *	fs,
		rtems_rfs_inode_handle *	dir,
		const char *	name,
		size_t	length,
		rtems_rfs_ino	ino
	)

Add an entry to the directory returing the inode number allocated to the entry.

Parameters

[in]	fs	is the file system data.
[in]	dir	is a pointer to the directory inode the entry is to be added too.
[in]	name	is a pointer to the name of the entry to be added.
[in]	length	is the length of the name excluding a terminating 0.
[in]	ino	is the ino of the entry.

Return values

0	Successful operation.
error_code	An error occurred.

◆ rtems_rfs_dir_del_entry()

int rtems_rfs_dir_del_entry	(	rtems_rfs_file_system *	fs,
		rtems_rfs_inode_handle *	dir,
		rtems_rfs_ino	ino,
		uint32_t	offset
	)

Del an entry from the directory using an inode number as a key.

Parameters

[in]	fs	is the file system data.
[in]	dir	is a pointer to the directory inode the entry is to be deleted from.
[in]	ino	is the ino of the entry.
[in]	offset	is the offset in the directory of the entry to delete. If 0 search from the start for the ino.

Return values

0	Successful operation.
error_code	An error occurred.

◆ rtems_rfs_dir_empty()

int rtems_rfs_dir_empty	(	rtems_rfs_file_system *	fs,
		rtems_rfs_inode_handle *	dir
	)

Check if the directory is empty. The current and parent directory entries are ignored.

Parameters

[in]	fs	is the file system data
[in]	dir	is a pointer to the directory inode to check.

Return values

0	Successful operation.
error_code	An error occurred.

◆ rtems_rfs_dir_lookup_ino()

int rtems_rfs_dir_lookup_ino	(	rtems_rfs_file_system *	fs,
		rtems_rfs_inode_handle *	inode,
		const char *	name,
		int	length,
		rtems_rfs_ino *	ino,
		uint32_t *	offset
	)

Look up a directory entry in the directory pointed to by the inode. The look up is local to this directory. No need to decend.

Parameters

[in]	fs	is the file system.
[in]	inode	is a pointer to the inode of the directory to search.
[in]	name	is a pointer to the name to look up. The name may not be nul terminated.
[in]	length	is the length of the name.
[out]	ino	will be filled in with the inode number if there is no error.
[in]	offset	is the offset in the directory for the entry.

Return values

0	Successful operation.
error_code	An error occurred.

◆ rtems_rfs_dir_read()

int rtems_rfs_dir_read	(	rtems_rfs_file_system *	fs,
		rtems_rfs_inode_handle *	dir,
		rtems_rfs_pos_rel	offset,
		struct dirent *	dirent,
		size_t *	length
	)

Read the directory entry from offset into the directory entry buffer and return the length of space this entry uses in the directory table.

Parameters

[in]	fs	is the file system data.
[in]	dir	is a pointer to the direct inode handler.
[in]	offset	is the offset in the directory to read from.
[in]	dirent	is a ointer to the dirent structure the entry is written into.
[out]	length	will contain the length this entry takes in the directory.

Return values

0	Successful operation.
error_code	An error occurred.

Macros

Functions

Detailed Description

Macro Definition Documentation

◆ RTEMS_RFS_DIR_ENTRY_EMPTY

◆ RTEMS_RFS_DIR_ENTRY_HASH

◆ rtems_rfs_dir_entry_hash

◆ RTEMS_RFS_DIR_ENTRY_INO

◆ rtems_rfs_dir_entry_ino

◆ RTEMS_RFS_DIR_ENTRY_LEN

◆ rtems_rfs_dir_entry_length

◆ RTEMS_RFS_DIR_ENTRY_SIZE

◆ rtems_rfs_dir_set_entry_hash

◆ rtems_rfs_dir_set_entry_ino

◆ rtems_rfs_dir_set_entry_length

Function Documentation

◆ rtems_rfs_dir_add_entry()

◆ rtems_rfs_dir_del_entry()

◆ rtems_rfs_dir_empty()

◆ rtems_rfs_dir_lookup_ino()

◆ rtems_rfs_dir_read()