nuttx/fs/littlefs/Kconfig

config FS_LITTLEFS
	bool "LITTLEFS File System"
	default n
	depends on !DISABLE_MOUNTPOINT
	---help---
		Build the LITTLEFS file system. https://github.com/littlefs-project/littlefs.

if FS_LITTLEFS
config FS_LITTLEFS_PROGRAM_SIZE_FACTOR
	int "LITTLEFS Program size multiplication factor"
	default 4
	---help---
		A factor used for multiplying program size.

		The result is used as the minimum size of a block program in bytes.
		All program operations will be a multiple of the result.

config FS_LITTLEFS_READ_SIZE_FACTOR
	int "LITTLEFS Read size multiplication factor"
	default FS_LITTLEFS_PROGRAM_SIZE_FACTOR
	---help---
		A factor used for multiplying read size.

		The result is used as the minimum size of a block read in bytes.
		All read operations will be a multiple of the result.

config FS_LITTLEFS_BLOCK_SIZE_FACTOR
	int "LITTLEFS Block size multiplication factor"
	default 1
	---help---
		A factor used for multiplying block size and dividing block count.

		The result is size of an erasable block in bytes. This does not impact ram consumption
		and may be larger than the physical erase size. However, non-inlined
		files take up at minimum one block. Must be a multiple of the read and
		program sizes.

config FS_LITTLEFS_CACHE_SIZE_FACTOR
	int "LITTLEFS Cache size multiplication factor"
	default FS_LITTLEFS_READ_SIZE_FACTOR
	---help---
		A factor used for multiplying cache size.

		The result is size of block caches in bytes.
		Each cache buffers a portion of a block in RAM.
		The littlefs needs a read cache, a program cache, and one additional
		cache per file. A larger cache can improve performance by storing more
		data and reducing the number of disk accesses. It must be a multiple of the
		read and program sizes, and a factor of the block size.

config FS_LITTLEFS_LOOKAHEAD_SIZE
	int "LITTLEFS Lookahead size"
	default 0
	---help---
		Size of the lookahead buffer in bytes. A larger lookahead buffer
		increases the number of blocks found during an allocation pass. The
		lookahead buffer is stored as a compact bitmap, so each byte of RAM
		can track 8 blocks. Must be a multiple of 8.

		Set value 0 for enabling internal calculation.

config FS_LITTLEFS_BLOCK_CYCLE
	int "LITTLEFS Block cycle"
	default 200
	---help---
		Number of erase cycles before littlefs evicts metadata logs and moves
		the metadata to another block. Suggested values are in the
		range 100-1000, with large values having better performance at the cost
		of less consistent wear distribution.

		Set to -1 to disable block-level wear-leveling.

config FS_LITTLEFS_NAME_MAX
	int "LITTLEFS LFS_NAME_MAX"
	default NAME_MAX
	---help---
		Configure LFS_NAME_MAX value for LITTLEFS file systems.

		Note: Using a larger value for this configuration makes the lfs_info
		structure larger and thus increases the stack usage.

		Note: To mount a LITTLEFS filesystem, this configuration should
		equal to or larger than the corresponding on-disk parameter.

		Note: Many of tools to generate LITTLEFS images use 255 for
		this by default.

		Note: NuttX releases prior to 10.4.0 (exclusive) uses 255
		for this. If you need to mount LITTLEFS filesystems used by
		previous versions of NuttX, it's safer to use 255.

config FS_LITTLEFS_FILE_MAX
	int "LITTLEFS LFS_FILE_MAX"
	default 2147483647
	---help---
		Configure LFS_FILE_MAX value for LITTLEFS file systems.

		Note: To mount a LITTLEFS filesystem, this configuration should
		equal to or larger than the corresponding on-disk parameter.

		Note: Many of tools to generate LITTLEFS images use 2147483647
		for this by default.

config FS_LITTLEFS_ATTR_MAX
	int "LITTLEFS LFS_ATTR_MAX"
	default 1022
	---help---
		Configure LFS_ATTR_MAX value for LITTLEFS file systems.

		Note: To mount a LITTLEFS filesystem, this configuration should
		equal to or larger than the corresponding on-disk parameter.

		Note: because NuttX's LITTLEFS driver does never use custom attributes,
		the value of this configuration doesn't matter much. The default value
		here is chosen to be compatible with filesystems created by external
		tools. Unlike LFS_NAME_MAX, a large LFS_ATTR_MAX value doesn't
		have any runtime overhead, at least with the implementation as of
		writing this.

		Note: Many of tools to generate LITTLEFS images use 1022
		for this by default.
endif