LittleFileSystem, a little file system. More...

#include <LittleFileSystem.h>

Public Member Functions
	LittleFileSystem (const char name=NULL, mbed::BlockDevice bd=NULL, lfs_size_t read_size=MBED_LFS_READ_SIZE, lfs_size_t prog_size=MBED_LFS_PROG_SIZE, lfs_size_t block_size=MBED_LFS_BLOCK_SIZE, lfs_size_t lookahead=MBED_LFS_LOOKAHEAD)
	Lifetime of the LittleFileSystem.
virtual int	mount (mbed::BlockDevice *bd)
	Mount a file system to a block device.
virtual int	unmount ()
	Unmount a file system from the underlying block device.
virtual int	reformat (mbed::BlockDevice *bd)
	Reformat a file system.
virtual int	remove (const char *path)
	Remove a file from the file system.
virtual int	rename (const char path, const char newpath)
	Rename a file in the file system.
virtual int	stat (const char path, struct stat st)
	Store information about the file in a stat structure.
virtual int	mkdir (const char *path, mode_t mode)
	Create a directory in the file system.
virtual int	statvfs (const char path, struct statvfs buf)
	Store information about the mounted file system in a statvfs structure.
	MBED_DEPRECATED_SINCE ("mbed-os-5.5","Replaced by `int open(FileHandle *, ...)` for propagating error codes") FileHandle open(const char *path
	Open a file on the filesystem.
Static Public Member Functions
static int	format (mbed::BlockDevice *bd, lfs_size_t read_size=MBED_LFS_READ_SIZE, lfs_size_t prog_size=MBED_LFS_PROG_SIZE, lfs_size_t block_size=MBED_LFS_BLOCK_SIZE, lfs_size_t lookahead=MBED_LFS_LOOKAHEAD)
	Format a block device with the LittleFileSystem.
static FileSystem *	get_default_instance ()
	Return the default file system.
Protected Member Functions
virtual int	file_open (mbed::fs_file_t file, const char path, int flags)
	Open a file on the file system.
virtual int	file_close (mbed::fs_file_t file)
	Close a file.
virtual ssize_t	file_read (mbed::fs_file_t file, void *buffer, size_t size)
	Read the contents of a file into a buffer.
virtual ssize_t	file_write (mbed::fs_file_t file, const void *buffer, size_t size)
	Write the contents of a buffer to a file.
virtual int	file_sync (mbed::fs_file_t file)
	Flush any buffers associated with the file.
virtual off_t	file_seek (mbed::fs_file_t file, off_t offset, int whence)
	Move the file position to a given offset from a given location.
virtual off_t	file_tell (mbed::fs_file_t file)
	Get the file position of the file.
virtual off_t	file_size (mbed::fs_file_t file)
	Get the size of the file.
virtual int	file_truncate (mbed::fs_file_t file, off_t length)
	Truncate or extend a file.
virtual int	dir_open (mbed::fs_dir_t dir, const char path)
	Open a directory on the file system.
virtual int	dir_close (mbed::fs_dir_t dir)
	Close a directory.
virtual ssize_t	dir_read (mbed::fs_dir_t dir, struct dirent *ent)
	Read the next directory entry.
virtual void	dir_seek (mbed::fs_dir_t dir, off_t offset)
	Set the current position of the directory.
virtual off_t	dir_tell (mbed::fs_dir_t dir)
	Get the current position of the directory.
virtual void	dir_rewind (mbed::fs_dir_t dir)
	Rewind the current position to the beginning of the directory.
virtual int	file_isatty (fs_file_t file)
	Check whether the file is an interactive terminal device.
virtual void	file_rewind (fs_file_t file)
	Rewind the file position to the beginning of the file.
virtual size_t	dir_size (fs_dir_t dir)
	Get the size of the directory.
virtual int	open (FileHandle *file, const char path, int flags)
	Open a file on the filesystem.
virtual int	open (DirHandle *dir, const char path)
	Open a directory on the filesystem.
	MBED_DEPRECATED ("Invalid copy construction of a NonCopyable resource.") NonCopyable(const NonCopyable &)
	NonCopyable copy constructor.
	MBED_DEPRECATED ("Invalid copy assignment of a NonCopyable resource.") NonCopyable &operator
	NonCopyable copy assignment operator.

Detailed Description

LittleFileSystem, a little file system.

Synchronization level: Thread safe

Definition at line 35 of file LittleFileSystem.h.

Constructor & Destructor Documentation

LittleFileSystem	(	const char *	name = `NULL`,
		mbed::BlockDevice *	bd = `NULL`,
		lfs_size_t	read_size = `MBED_LFS_READ_SIZE`,
		lfs_size_t	prog_size = `MBED_LFS_PROG_SIZE`,
		lfs_size_t	block_size = `MBED_LFS_BLOCK_SIZE`,
		lfs_size_t	lookahead = `MBED_LFS_LOOKAHEAD`
	)

Lifetime of the LittleFileSystem.

Parameters:

name	Name of the file system in the tree.
bd	Block device to mount. Mounted immediately if not NULL.
read_size	Minimum size of a block read. This determines the size of read buffers. This may be larger than the physical read size to improve performance by caching more of the block device.
prog_size	Minimum size of a block program. This determines the size of program buffers. This may be larger than the physical program size to improve performance by caching more of the block device.
block_size	Size of an erasable block. This does not impact ram consumption and may be larger than the physical erase size. However, this should be kept small as each file currently takes up an entire block.
lookahead	Number of blocks to lookahead during block allocation. A larger lookahead reduces the number of passes required to allocate a block. The lookahead buffer requires only 1 bit per block so it can be quite large with little ram impact. Should be a multiple of 32.

Definition at line 146 of file LittleFileSystem.cpp.

Member Function Documentation

int dir_close ( mbed::fs_dir_t dir ) [protected, virtual]

Close a directory.

Parameters:

dir	Dir handle. return 0 on success, negative error code on failure

Reimplemented from FileSystem.

Definition at line 537 of file LittleFileSystem.cpp.

int dir_open	(	mbed::fs_dir_t *	dir,
		const char *	path
	)		`[protected, virtual]`

Open a directory on the file system.

Parameters:

dir	Destination for the handle to the directory.
path	Name of the directory to open.

Returns:: 0 on success, negative error code on failure

Reimplemented from FileSystem.

Definition at line 521 of file LittleFileSystem.cpp.

ssize_t dir_read	(	mbed::fs_dir_t	dir,
		struct dirent *	ent
	)		`[protected, virtual]`

Read the next directory entry.

Parameters:

dir	Dir handle.
ent	The directory entry to fill out.

Returns:: 1 on reading a filename, 0 at end of directory, negative error on failure

Reimplemented from FileSystem.

Definition at line 549 of file LittleFileSystem.cpp.

void dir_rewind ( mbed::fs_dir_t dir ) [protected, virtual]

Rewind the current position to the beginning of the directory.

Parameters:

dir	Dir handle

Reimplemented from FileSystem.

Definition at line 586 of file LittleFileSystem.cpp.

void dir_seek	(	mbed::fs_dir_t	dir,
		off_t	offset
	)		`[protected, virtual]`

Set the current position of the directory.

Parameters:

dir	Dir handle.
offset	Offset of the location to seek to, must be a value returned from dir_tell

Reimplemented from FileSystem.

Definition at line 565 of file LittleFileSystem.cpp.

size_t dir_size ( fs_dir_t dir ) [protected, virtual, inherited]

Get the size of the directory.

Parameters:

dir	Dir handle.

Returns:: Number of files in the directory.

Definition at line 122 of file FileSystem.cpp.

off_t dir_tell ( mbed::fs_dir_t dir ) [protected, virtual]

Get the current position of the directory.

Parameters:

dir	Dir handle.

Returns:: Position of the directory that can be passed to dir_rewind

Reimplemented from FileSystem.

Definition at line 575 of file LittleFileSystem.cpp.

int file_close ( mbed::fs_file_t file ) [protected, virtual]

Close a file.

Parameters:

file	File handle. return 0 on success, negative error code on failure

Implements FileSystem.

Definition at line 430 of file LittleFileSystem.cpp.

int file_isatty ( fs_file_t file ) [protected, virtual, inherited]

Check whether the file is an interactive terminal device.

If so, line buffered behavior is used by default.

Parameters:

file	File handle.

Returns:: True if the file is a terminal.

Definition at line 64 of file FileSystem.cpp.

int file_open	(	mbed::fs_file_t *	file,
		const char *	path,
		int	flags
	)		`[protected, virtual]`

Open a file on the file system.

Parameters:

file	Destination of the newly created handle to the referenced file.
path	The name of the file to open.
flags	The flags that trigger opening of the file. These flags are O_RDONLY, O_WRONLY, and O_RDWR, with an O_CREAT, O_TRUNC, or O_APPEND bitwise OR operator.

Returns:: 0 on success, negative error code on failure.

Implements FileSystem.

Definition at line 414 of file LittleFileSystem.cpp.

ssize_t file_read	(	mbed::fs_file_t	file,
		void *	buffer,
		size_t	size
	)		`[protected, virtual]`

Read the contents of a file into a buffer.

Parameters:

file	File handle.
buffer	The buffer to read in to.
size	The number of bytes to read.

Returns:: The number of bytes read, 0 at end of file, negative error on failure

Implements FileSystem.

Definition at line 442 of file LittleFileSystem.cpp.

void file_rewind ( fs_file_t file ) [protected, virtual, inherited]

Rewind the file position to the beginning of the file.

Parameters:

file	File handle.

Note:: This is equivalent to file_seek(file, 0, FS_SEEK_SET)

Definition at line 74 of file FileSystem.cpp.

off_t file_seek	(	mbed::fs_file_t	file,
		off_t	offset,
		int	whence
	)		`[protected, virtual]`

Move the file position to a given offset from a given location.

Parameters:

file	File handle.
offset	The offset from whence to move to.
whence	The start of where to seek. SEEK_SET to start from beginning of file, SEEK_CUR to start from current position in file, SEEK_END to start from end of file.

Returns:: The new offset of the file

Implements FileSystem.

Definition at line 475 of file LittleFileSystem.cpp.

off_t file_size ( mbed::fs_file_t file ) [protected, virtual]

Get the size of the file.

Parameters:

file	File handle.

Returns:: Size of the file in bytes

Reimplemented from FileSystem.

Definition at line 497 of file LittleFileSystem.cpp.

int file_sync ( mbed::fs_file_t file ) [protected, virtual]

Flush any buffers associated with the file.

Parameters:

file	File handle.

Returns:: 0 on success, negative error code on failure

Reimplemented from FileSystem.

Definition at line 464 of file LittleFileSystem.cpp.

off_t file_tell ( mbed::fs_file_t file ) [protected, virtual]

Get the file position of the file.

Parameters:

file	File handle.

Returns:: The current offset in the file

Reimplemented from FileSystem.

Definition at line 486 of file LittleFileSystem.cpp.

int file_truncate	(	mbed::fs_file_t	file,
		off_t	length
	)		`[protected, virtual]`

Truncate or extend a file.

The file's length is set to the specified value. The seek pointer is not changed. If the file is extended, the extended area appears as if it were zero-filled.

Parameters:

file	File handle.
length	The requested new length for the file

Returns:: Zero on success, negative error code on failure

Reimplemented from FileSystem.

Definition at line 508 of file LittleFileSystem.cpp.

ssize_t file_write	(	mbed::fs_file_t	file,
		const void *	buffer,
		size_t	size
	)		`[protected, virtual]`

Write the contents of a buffer to a file.

Parameters:

file	File handle.
buffer	The buffer to write from.
size	The number of bytes to write.

Returns:: The number of bytes written, negative error on failure

Implements FileSystem.

Definition at line 453 of file LittleFileSystem.cpp.

int format	(	mbed::BlockDevice *	bd,
		lfs_size_t	read_size = `MBED_LFS_READ_SIZE`,
		lfs_size_t	prog_size = `MBED_LFS_PROG_SIZE`,
		lfs_size_t	block_size = `MBED_LFS_BLOCK_SIZE`,
		lfs_size_t	lookahead = `MBED_LFS_LOOKAHEAD`
	)		`[static]`

Format a block device with the LittleFileSystem.

The block device to format should be mounted when this function is called.

Parameters:

bd	This is the block device that will be formatted.
read_size	Minimum size of a block read. This determines the size of read buffers. This may be larger than the physical read size to improve performance by caching more of the block device.
prog_size	Minimum size of a block program. This determines the size of program buffers. This may be larger than the physical program size to improve performance by caching more of the block device.
block_size	Size of an erasable block. This does not impact ram consumption and may be larger than the physical erase size. However, this should be kept small as each file currently takes up an entire block.
lookahead	Number of blocks to lookahead during block allocation. A larger lookahead reduces the number of passes required to allocate a block. The lookahead buffer requires only 1 bit per block so it can be quite large with little ram impact. Should be a multiple of 32.

Definition at line 243 of file LittleFileSystem.cpp.

MBED_WEAK FileSystem * get_default_instance ( ) [static, inherited]

Return the default file system.

Returns the default file system based on the default block device configuration. Use the components in target.json or application config to change the default block device and affect the default filesystem. SD block device => FAT filesystem QSPIF, SPIF, DATAFLASH or FLAHIAP block device => LITTLE filesystem

An application can override all target settings by implementing FileSystem::get_default_instance() - the default definition is weak, and calls get_target_default_instance().

Definition at line 172 of file SystemStorage.cpp.

MBED_DEPRECATED ( "Invalid copy construction of a NonCopyable< FileBase > resource." ) const [protected, inherited]

NonCopyable copy constructor.

A compile time warning is issued when this function is used, and a runtime warning is printed when the copy construction of the noncopyable happens.

If you see this warning, your code is probably doing something unspecified. Copying of noncopyable resources can lead to resource leak and random error.

Definition at line 191 of file NonCopyable.h.

MBED_DEPRECATED ( "Invalid copy assignment of a NonCopyable< FileBase > resource." ) [protected, inherited]

NonCopyable copy assignment operator.

A compile time warning is issued when this function is used, and a runtime warning is printed when the copy construction of the noncopyable happens.

If you see this warning, your code is probably doing something unspecified. Copying of noncopyable resources can lead to resource leak and random error.

MBED_DEPRECATED_SINCE	(	"mbed-os-5.5"	,
		"Replaced by `int open(FileHandle **, ...)` for propagating error codes"
	)		const `[inherited]`

Open a file on the filesystem.

Parameters:

path	The name of the file to open
flags	The flags to open the file in, one of O_RDONLY, O_WRONLY, O_RDWR, bitwise or'd with one of O_CREAT, O_TRUNC, O_APPEND

Returns:: A file handle on success, NULL on failure

int mkdir	(	const char *	path,
		mode_t	mode
	)		`[virtual]`

Create a directory in the file system.

Parameters:

path	The name of the directory to create.
mode	The permissions with which to create the directory.

Returns:: 0 on success, negative error code on failure

Reimplemented from FileSystem.

Definition at line 361 of file LittleFileSystem.cpp.

int mount ( mbed::BlockDevice * bd ) [virtual]

Mount a file system to a block device.

Parameters:

bd	Block device to mount to.

Returns:: 0 on success, negative error code on failure.

Implements FileSystem.

Definition at line 169 of file LittleFileSystem.cpp.

int open	(	FileHandle **	file,
		const char *	filename,
		int	flags
	)		`[protected, virtual, inherited]`

Open a file on the filesystem.

Parameters:

file	Destination for the handle to a newly created file
filename	The name of the file to open
flags	The flags to open the file in, one of O_RDONLY, O_WRONLY, O_RDWR, bitwise or'd with one of O_CREAT, O_TRUNC, O_APPEND

Returns:: 0 on success, negative error code on failure

Implements FileSystemHandle.

Definition at line 155 of file FileSystem.cpp.

int open	(	DirHandle **	dir,
		const char *	path
	)		`[protected, virtual, inherited]`

Open a directory on the filesystem.

Parameters:

dir	Destination for the handle to the directory
path	Name of the directory to open

Returns:: 0 on success, negative error code on failure

Reimplemented from FileSystemHandle.

Definition at line 168 of file FileSystem.cpp.

int reformat ( mbed::BlockDevice * bd ) [virtual]

Reformat a file system.

Results in an empty and mounted file system.

Parameters:

bd	Block device to reformat and mount. If NULL, the mounted Block device is used. Note: If mount fails, bd must be provided. Default: NULL

Returns:: 0 on success, negative error code on failure

Reimplemented from FileSystem.

Definition at line 298 of file LittleFileSystem.cpp.

int remove ( const char * path ) [virtual]

Remove a file from the file system.

Parameters:

path	The name of the file to remove.

Returns:: 0 on success, negative error code on failure

Reimplemented from FileSystem.

Definition at line 341 of file LittleFileSystem.cpp.

int rename	(	const char *	path,
		const char *	newpath
	)		`[virtual]`

Rename a file in the file system.

Parameters:

path	The name of the file to rename.
newpath	The name to rename it to.

Returns:: 0 on success, negative error code on failure

Reimplemented from FileSystem.

Definition at line 351 of file LittleFileSystem.cpp.

int stat	(	const char *	path,
		struct stat *	st
	)		`[virtual]`

Store information about the file in a stat structure.

Parameters:

path	The name of the file to find information about.
st	The stat buffer to write to.

Returns:: 0 on success, negative error code on failure

Reimplemented from FileSystem.

Definition at line 371 of file LittleFileSystem.cpp.

int statvfs	(	const char *	path,
		struct statvfs *	buf
	)		`[virtual]`

Store information about the mounted file system in a statvfs structure.

Parameters:

path	The name of the file to find information about.
buf	The stat buffer to write to.

Returns:: 0 on success, negative error code on failure

Reimplemented from FileSystem.

Definition at line 390 of file LittleFileSystem.cpp.

int unmount ( ) [virtual]

Unmount a file system from the underlying block device.

Returns:: 0 on success, negative error code on failure

Implements FileSystem.

Definition at line 219 of file LittleFileSystem.cpp.

Type:	Library
Created:	17 Dec 2019
Imports:	79
Forks:	0
Commits:	2
Dependents:	2
Dependencies:	0
Followers:	1

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