File System Types and Mount

File system types and mount. More...

Modules
	Device Only File System
	This structure defines the type of device table.
	FAT Filesystem Support
	FAT file system configuration support, format and mount options.
	FIFO/Pipe File System Support
	Interface to the POSIX FIFO/Pipe File System.
	File System Mount Support
	File System Mount Functions.
	In-Memory File System Support
	In-Memory File System Support.
	Journalling Flash File System Version 2 (JFFS2) Support
	Mount options for the Journalling Flash File System, Version 2 (JFFS2).
	RTEMS File System Group Management
	libfs
	libfs
	nfs Client
	nfs Client

Files
file	mount.c
	Mounts a File System.

Data Structures
struct	rtems_filesystem_mount_table_entry_tt
	Mount table entry. More...
struct	rtems_filesystem_table_t
	File system table entry. More...
struct	rtems_filesystem_mount_configuration

Typedefs
typedef struct rtems_filesystem_table_t	rtems_filesystem_table_t
	File system table entry.
typedef bool(*	rtems_per_filesystem_routine) (const rtems_filesystem_table_t *fs_entry, void *arg)
	Per file system type routine. More...
typedef bool(*	rtems_filesystem_mt_entry_visitor) (const rtems_filesystem_mount_table_entry_t *mt_entry, void *arg)
	Mount table entry visitor. More...

Enumerations
enum	rtems_filesystem_options_t { RTEMS_FILESYSTEM_READ_ONLY, RTEMS_FILESYSTEM_READ_WRITE, RTEMS_FILESYSTEM_BAD_OPTIONS }
	File system options.

Functions
int	rtems_filesystem_register (const char *type, rtems_filesystem_fsmount_me_t mount_h)
	Registers a file system type. More...
int	rtems_filesystem_unregister (const char *type)
	Unregisters a file system type. More...
int	unmount (const char *mount_path)
	Unmounts the file system instance at the specified mount path. More...
int	mount (const char *source, const char *target, const char *filesystemtype, rtems_filesystem_options_t options, const void *data)
	Mounts a file system instance at the specified target path. More...
int	mount_and_make_target_path (const char *source, const char *target, const char *filesystemtype, rtems_filesystem_options_t options, const void *data)
	Mounts a file system and makes the target path. More...
bool	rtems_filesystem_iterate (rtems_per_filesystem_routine routine, void *routine_arg)
	Iterates over all file system types. More...
bool	rtems_filesystem_mount_iterate (rtems_filesystem_mt_entry_visitor visitor, void *visitor_arg)
	Iterates over all file system mount entries. More...

Variables
const rtems_filesystem_table_t	rtems_filesystem_table []
	Static table of file systems. More...
rtems_chain_control	rtems_filesystem_mount_table
const rtems_filesystem_mount_configuration	rtems_filesystem_root_configuration

File System Types
#define	RTEMS_FILESYSTEM_TYPE_IMFS   "imfs"
#define	RTEMS_FILESYSTEM_TYPE_MINIIMFS   "mimfs"
#define	RTEMS_FILESYSTEM_TYPE_DEVFS   "devfs"
#define	RTEMS_FILESYSTEM_TYPE_FTPFS   "ftpfs"
#define	RTEMS_FILESYSTEM_TYPE_TFTPFS   "tftpfs"
#define	RTEMS_FILESYSTEM_TYPE_NFS   "nfs"
#define	RTEMS_FILESYSTEM_TYPE_DOSFS   "dosfs"
#define	RTEMS_FILESYSTEM_TYPE_RFS   "rfs"
#define	RTEMS_FILESYSTEM_TYPE_JFFS2   "jffs2"

Detailed Description

File system types and mount.

Typedef Documentation

rtems_filesystem_mt_entry_visitor

typedef bool(* rtems_filesystem_mt_entry_visitor) (const rtems_filesystem_mount_table_entry_t *mt_entry, void *arg)

Mount table entry visitor.

Return values

true	Stop the iteration.
false	Continue the iteration.

See also

rtems_filesystem_mount_iterate().

rtems_per_filesystem_routine

typedef bool(* rtems_per_filesystem_routine) (const rtems_filesystem_table_t *fs_entry, void *arg)

Per file system type routine.

See also

rtems_filesystem_iterate().

Return values

true	Stop the iteration.
false	Continue the iteration.

Function Documentation

mount()

int mount	(	const char *	source,
		const char *	target,
		const char *	filesystemtype,
		rtems_filesystem_options_t	options,
		const void *	data
	)

Mounts a file system instance at the specified target path.

To mount a standard file system instance one of the following defines should be used to select the file system type

• RTEMS_FILESYSTEM_TYPE_DEVFS,
• RTEMS_FILESYSTEM_TYPE_DOSFS,
• RTEMS_FILESYSTEM_TYPE_FTPFS,
• RTEMS_FILESYSTEM_TYPE_IMFS,
• RTEMS_FILESYSTEM_TYPE_JFFS2,
• RTEMS_FILESYSTEM_TYPE_MINIIMFS,
• RTEMS_FILESYSTEM_TYPE_NFS,
• RTEMS_FILESYSTEM_TYPE_RFS, or
• RTEMS_FILESYSTEM_TYPE_TFTPFS.

Only configured or registered file system types are available. You can add file system types to your application configuration with the following configuration options

• CONFIGURE_FILESYSTEM_DEVFS,
• CONFIGURE_FILESYSTEM_DOSFS,
• CONFIGURE_FILESYSTEM_FTPFS,
• CONFIGURE_FILESYSTEM_IMFS,
• CONFIGURE_FILESYSTEM_JFFS2,
• CONFIGURE_FILESYSTEM_MINIIMFS,
• CONFIGURE_FILESYSTEM_NFS,
• CONFIGURE_FILESYSTEM_RFS, and
• CONFIGURE_FILESYSTEM_TFTPFS.

In addition to these configuration options file system types can be registered with rtems_filesystem_register().

Parameters

[in]	source	The source parameter will be forwarded to the file system initialization handler. Usually the source is a path to the corresponding device file, or NULL in case the file system does not use a device file.
[in]	target	The target path must lead to an existing directory, or must be NULL. In case the target is NULL, the root file system will be mounted.
[in]	filesystemtype	This string selects the file system type.
[in]	options	The options specify if the file system instance allows read-write or read-only access.
[in]	data	The data parameter will be forwarded to the file system initialization handler. It can be used to pass file system specific mount options. The data structure for mount options is file system specific. See also in the corresponding file system documentation.

Return values

0	Successful operation.
-1	An error occurred. The errno indicates the error.

See also

rtems_filesystem_register(), mount_and_make_target_path(), FAT Filesystem Support and Journalling Flash File System Version 2 (JFFS2) Support.

mount_and_make_target_path()

int mount_and_make_target_path	(	const char *	source,
		const char *	target,
		const char *	filesystemtype,
		rtems_filesystem_options_t	options,
		const void *	data
	)

Mounts a file system and makes the target path.

The target path will be created with rtems_mkdir() and must not be NULL.

See also

mount().

Return values

0	Successful operation.
-1	An error occurred. The errno indicates the error.

rtems_filesystem_iterate()

bool rtems_filesystem_iterate	(	rtems_per_filesystem_routine	routine,
		void *	routine_arg
	)

Iterates over all file system types.

For each file system type the routine will be called with the entry and the routine_arg parameter.

Do not register or unregister file system types in routine.

The iteration is protected by the IO library mutex.

Return values

true	Iteration stopped due to routine return status.
false	Iteration through all entries.

rtems_filesystem_mount_iterate()

bool rtems_filesystem_mount_iterate	(	rtems_filesystem_mt_entry_visitor	visitor,
		void *	visitor_arg
	)

Iterates over all file system mount entries.

The iteration is protected by the IO library mutex. Do not mount or unmount file systems in the visitor function.

Parameters

[in]	visitor	For each file system mount entry the visitor function will be called with the entry and the visitor argument as parameters.
[in]	visitor_arg	The second parameter for the visitor function.

Return values

true	Iteration stopped due to visitor function return status.
false	Iteration through all entries.

rtems_filesystem_register()

int rtems_filesystem_register	(	const char *	type,
		rtems_filesystem_fsmount_me_t	mount_h
	)

Registers a file system type.

The mount_h handler will be used to mount a file system of this type.

Return values

0	Successful operation.
-1	An error occurred. The errno indicates the error.

rtems_filesystem_unregister()

int rtems_filesystem_unregister

(

const char *

type

)

Unregisters a file system type.

Return values

0	Successful operation.
-1	An error occurred. The errno indicates the error.

unmount()

int unmount

(

const char *

path

)

Unmounts the file system instance at the specified mount path.

The function waits for the unmount process completion. In case the calling thread uses resources of the unmounted file system the function may never return. In case the calling thread has its root or current directory in the unmounted file system the function returns with an error status and errno is set to EBUSY.

The unmount process completion notification uses the transient event. It is a fatal error to terminate the calling thread while waiting for this event.

A concurrent unmount request for the same file system instance has unpredictable effects.

Parameters

[in]

mount_path

The path to the file system instance mount point.

Return values

0	Successful operation.
-1	An error occurred. The errno indicates the error.

See also

Transient Event.

This routine is not defined in the POSIX 1003.1b standard but in some form is supported on most UNIX and POSIX systems. This routine is necessary to mount instantiations of a file system into the file system name space.

Variable Documentation

rtems_filesystem_table

const rtems_filesystem_table_t rtems_filesystem_table[]

Static table of file systems.

Externally defined by confdefs.h or the user.