rtems-rfs-link.c File Reference

RTEMS File Systems Link Routines. More...

#include <inttypes.h>
#include <string.h>
#include <rtems/rfs/rtems-rfs-block.h>
#include <rtems/rfs/rtems-rfs-buffer.h>
#include <rtems/rfs/rtems-rfs-file-system.h>
#include <rtems/rfs/rtems-rfs-trace.h>
#include <rtems/rfs/rtems-rfs-dir.h>
#include <rtems/rfs/rtems-rfs-dir-hash.h>
#include <rtems/rfs/rtems-rfs-link.h>

Functions
int	rtems_rfs_link (rtems_rfs_file_system *fs, const char *name, int length, rtems_rfs_ino parent, rtems_rfs_ino target, bool link_dir)
int	rtems_rfs_unlink (rtems_rfs_file_system *fs, rtems_rfs_ino parent, rtems_rfs_ino target, uint32_t doff, rtems_rfs_unlink_dir dir_mode)
int	rtems_rfs_symlink (rtems_rfs_file_system *fs, const char *name, int length, const char *link, int link_length, uid_t uid, gid_t gid, rtems_rfs_ino parent)
int	rtems_rfs_symlink_read (rtems_rfs_file_system *fs, rtems_rfs_ino link, char *path, size_t size, size_t *length)

Detailed Description

RTEMS File Systems Link Routines.

These functions manage links. A link is the addition of a directory entry in a parent directory and incrementing the links count in the inode.

Function Documentation

rtems_rfs_link()

int rtems_rfs_link	(	rtems_rfs_file_system *	fs,
		const char *	name,
		int	length,
		rtems_rfs_ino	parent,
		rtems_rfs_ino	target,
		bool	link_dir
	)

Create a link. Do not link directories unless renaming or you will create loops in the file system.

Parameters

[in]	fs	is the file system.
[in]	name	is a pointer to the name of the link.
[in]	length	is the length of the name.
[in]	parent	is the inode number of the parent directory.
[in]	target	is the inode of the target.
[in]	link_dir	If true directories can be linked. Useful when renaming.

Return values

0	Successful operation.
error_code	An error occurred.

rtems_rfs_symlink()

int rtems_rfs_symlink	(	rtems_rfs_file_system *	fs,
		const char *	name,
		int	length,
		const char *	link,
		int	link_length,
		uid_t	uid,
		gid_t	gid,
		rtems_rfs_ino	parent
	)

Symbolic link is an inode that has a path attached.

Parameters

[in]	fs	is the file system data.
[in]	name	is a pointer to the name of the node.
[in]	length	is the length of the name of the node.
[in]	link	is a pointer to the link path attached to the symlink inode.
[in]	link_length	is the length of the link path.
[in]	parent	is the parent inode number.

Return values

0	Successful operation.
error_code	An error occurred.

rtems_rfs_symlink_read()

int rtems_rfs_symlink_read	(	rtems_rfs_file_system *	fs,
		rtems_rfs_ino	link,
		char *	path,
		size_t	size,
		size_t *	length
	)

Read a symbolic link into the provided buffer returning the link of link name.

Parameters

[in]	fs	is the file system data.
[in]	link	is the link inode number to read.
[in]	path	is a pointer to the buffer to write the link path into.
[in]	size	is the size of the buffer.
[out]	length	will contain the length of the link path.

Return values

0	Successful operation.
error_code	An error occurred.

rtems_rfs_unlink()

int rtems_rfs_unlink	(	rtems_rfs_file_system *	fs,
		rtems_rfs_ino	parent,
		rtems_rfs_ino	target,
		uint32_t	doff,
		rtems_rfs_unlink_dir	dir_mode
	)

Unlink the node from the parent directory. A directory offset for the target entry is required because links cause a number of inode numbers to appear in a single directory so scanning does not work.

Parameters

[in]	fs	is the file system.
[in]	parent	is the inode number of the parent directory.
[in]	target	is the inode of the target.
[in]	doff	is the parent directory entry offset for the target entry.
[in]	dir_mode	is the directory unlink mode.

Return values

0	Successful operation.
error_code	An error occurred.