fs_file_system_t Struct Reference

File System interface structure. More...

#include <fs_sys.h>

Data Fields
File operations
int(*	open )(struct fs_file_t *filp, const char *fs_path, fs_mode_t flags)
	Opens or creates a file, depending on flags given.
ssize_t(*	read )(struct fs_file_t *filp, void *dest, size_t nbytes)
	Reads nbytes number of bytes.
ssize_t(*	write )(struct fs_file_t *filp, const void *src, size_t nbytes)
	Writes nbytes number of bytes.
int(*	lseek )(struct fs_file_t *filp, off_t off, int whence)
	Moves the file position to a new location in the file.
off_t(*	tell )(struct fs_file_t *filp)
	Retrieves the current position in the file.
int(*	truncate )(struct fs_file_t *filp, off_t length)
	Truncates/expands the file to the new length.
int(*	sync )(struct fs_file_t *filp)
	Flushes the cache of an open file.
int(*	close )(struct fs_file_t *filp)
	Flushes the associated stream and closes the file.
Directory operations
int(*	opendir )(struct fs_dir_t *dirp, const char *fs_path)
	Opens an existing directory specified by the path.
int(*	readdir )(struct fs_dir_t *dirp, struct fs_dirent *entry)
	Reads directory entries of an open directory.
int(*	closedir )(struct fs_dir_t *dirp)
	Closes an open directory.
File system level operations
int(*	mount )(struct fs_mount_t *mountp)
	Mounts a file system.
int(*	unmount )(struct fs_mount_t *mountp)
	Unmounts a file system.
int(*	unlink )(struct fs_mount_t *mountp, const char *name)
	Deletes the specified file or directory.
int(*	rename )(struct fs_mount_t *mountp, const char *from, const char *to)
	Renames a file or directory.
int(*	mkdir )(struct fs_mount_t *mountp, const char *name)
	Creates a new directory using specified path.
int(*	stat )(struct fs_mount_t *mountp, const char *path, struct fs_dirent *entry)
	Checks the status of a file or directory specified by the path.
int(*	statvfs )(struct fs_mount_t *mountp, const char *path, struct fs_statvfs *stat)
	Returns the total and available space on the file system volume.
int(*	mkfs )(uintptr_t dev_id, void *cfg, int flags)
	Formats a device to specified file system type.

Detailed Description

File System interface structure.

Field Documentation

close

int(* fs_file_system_t::close) (struct fs_file_t *filp)

Flushes the associated stream and closes the file.

Parameters

filp	File to close.

Returns

0 on success, negative errno code on fail.

closedir

int(* fs_file_system_t::closedir) (struct fs_dir_t *dirp)

Closes an open directory.

Parameters

dirp	Directory to close.

Returns

0 on success, negative errno code on fail.

lseek

int(* fs_file_system_t::lseek) (struct fs_file_t *filp, off_t off, int whence)

Moves the file position to a new location in the file.

Parameters

filp	File to move.
off	Relative offset from the position specified by whence.
whence	Position in the file. Possible values: SEEK_CUR, SEEK_SET, SEEK_END.

Returns

New position in the file or negative errno code on fail.

mkdir

int(* fs_file_system_t::mkdir) (struct fs_mount_t *mountp, const char *name)

Creates a new directory using specified path.

Parameters

mountp	Mount point.
name	Path to the directory to create.

Returns

0 on success, negative errno code on fail.

mkfs

int(* fs_file_system_t::mkfs) (uintptr_t dev_id, void *cfg, int flags)

Formats a device to specified file system type.

Available only if

CONFIG_FILE_SYSTEM_MKFS 

is enabled.

Parameters

dev_id	Device identifier.
cfg	File system configuration.
flags	Formatting flags.

Returns

0 on success, negative errno code on fail.

Note

This operation destroys existing data on the target device.

mount

int(* fs_file_system_t::mount) (struct fs_mount_t *mountp)

Mounts a file system.

Parameters

mountp

Mount point.

Returns

0 on success, negative errno code on fail.

open

int(* fs_file_system_t::open) (struct fs_file_t *filp, const char *fs_path, fs_mode_t flags)

Opens or creates a file, depending on flags given.

Parameters

filp	File to open/create.
fs_path	Path to the file.
flags	Flags for opening/creating the file.

Returns

0 on success, negative errno code on fail.

opendir

int(* fs_file_system_t::opendir) (struct fs_dir_t *dirp, const char *fs_path)

Opens an existing directory specified by the path.

Parameters

dirp	Directory to open.
fs_path	Path to the directory.

Returns

0 on success, negative errno code on fail.

read

ssize_t(* fs_file_system_t::read) (struct fs_file_t *filp, void *dest, size_t nbytes)

Reads nbytes number of bytes.

Parameters

filp	File to read from.
dest	Destination buffer.
nbytes	Number of bytes to read.

Returns

Number of bytes read on success, negative errno code on fail.

readdir

int(* fs_file_system_t::readdir) (struct fs_dir_t *dirp, struct fs_dirent *entry)

Reads directory entries of an open directory.

Parameters

dirp	Directory to read from.
entry	Next directory entry in the dirp directory.

Returns

0 on success, negative errno code on fail.

rename

int(* fs_file_system_t::rename) (struct fs_mount_t *mountp, const char *from, const char *to)

Renames a file or directory.

Parameters

mountp	Mount point.
from	Path to the file or directory to rename.
to	New name of the file or directory.

Returns

0 on success, negative errno code on fail.

stat

int(* fs_file_system_t::stat) (struct fs_mount_t *mountp, const char *path, struct fs_dirent *entry)

Checks the status of a file or directory specified by the path.

Parameters

mountp	Mount point.
path	Path to the file or directory.
entry	Directory entry.

Returns

0 on success, negative errno code on fail.

statvfs

int(* fs_file_system_t::statvfs) (struct fs_mount_t *mountp, const char *path, struct fs_statvfs *stat)

Returns the total and available space on the file system volume.

Parameters

mountp	Mount point.
path	Path to the file or directory.
stat	File system statistics.

Returns

0 on success, negative errno code on fail.

sync

int(* fs_file_system_t::sync) (struct fs_file_t *filp)

Flushes the cache of an open file.

Parameters

filp	File to flush.

Returns

0 on success, negative errno code on fail.

tell

off_t(* fs_file_system_t::tell) (struct fs_file_t *filp)

Retrieves the current position in the file.

Parameters

filp	File to get the current position from.

Returns

Current position in the file or negative errno code on fail.

truncate

int(* fs_file_system_t::truncate) (struct fs_file_t *filp, off_t length)

Truncates/expands the file to the new length.

Parameters

filp	File to truncate/expand.
length	New length of the file.

Returns

0 on success, negative errno code on fail.

unlink

int(* fs_file_system_t::unlink) (struct fs_mount_t *mountp, const char *name)

Deletes the specified file or directory.

Parameters

mountp	Mount point.
name	Path to the file or directory to delete.

Returns

0 on success, negative errno code on fail.

unmount

int(* fs_file_system_t::unmount) (struct fs_mount_t *mountp)

Unmounts a file system.

Parameters

mountp

Mount point.

Returns

0 on success, negative errno code on fail.

write

ssize_t(* fs_file_system_t::write) (struct fs_file_t *filp, const void *src, size_t nbytes)

Writes nbytes number of bytes.

Parameters

filp	File to write to.
src	Source buffer.
nbytes	Number of bytes to write.

Returns

Number of bytes written on success, negative errno code on fail.

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The documentation for this struct was generated from the following file:

• zephyr/fs/fs_sys.h