:orphan:

.. title:: FS_LITTLEFS_FC_HEAP_SIZE

.. option:: CONFIG_FS_LITTLEFS_FC_HEAP_SIZE

*Enable flexible file cache sizes for littlefs*

Type: ``int``

Help
====

littlefs requires a per-file buffer to cache data.

When applications customize littlefs configurations and support
different cache sizes for different partitions this preallocation is
inadequate as an application might require a small number of files
using a large cache size and a larger number of files using a
smaller cache size.  In that case application should provide a
positive value for the heap size.  Be aware that there is a
per-allocation overhead that affects how much usable space is
present in the heap.

If this option is set to a non-positive value the heap is sized to
support up to FS_LITTLE_FS_NUM_FILES blocks of
FS_LITTLEFS_CACHE_SIZE bytes.  Until FS_LITTLEFS_FC_MEM_POOL is
removed presence of that option changes the default to support
FS_LITTLEFS_FC_MEM_POOL_NUM_BLOCKS allocations of size
FS_LITTLEFS_MEM_POOL_MAX_SIZE

Direct dependencies
===================

\ :option:`FILE_SYSTEM_LITTLEFS <CONFIG_FILE_SYSTEM_LITTLEFS>` && \ :option:`FILE_SYSTEM <CONFIG_FILE_SYSTEM>`

*(Includes any dependencies from ifs and menus.)*

Default
=======

- 0

Kconfig definition
==================

.. highlight:: kconfig

At ``subsys/fs/Kconfig.littlefs:132``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:34`` → ``subsys/Kconfig:25`` → ``subsys/fs/Kconfig:61``

Menu path: (Top) → Sub Systems and OS Services → File Systems → File system support → LittleFS support

.. parsed-literal::

    config FS_LITTLEFS_FC_HEAP_SIZE
    	int "Enable flexible file cache sizes for littlefs"
    	default 0
    	depends on \ :option:`FILE_SYSTEM_LITTLEFS <CONFIG_FILE_SYSTEM_LITTLEFS>` && \ :option:`FILE_SYSTEM <CONFIG_FILE_SYSTEM>`
    	help
    	  littlefs requires a per-file buffer to cache data.
	  
    	  When applications customize littlefs configurations and support
    	  different cache sizes for different partitions this preallocation is
    	  inadequate as an application might require a small number of files
    	  using a large cache size and a larger number of files using a
    	  smaller cache size.  In that case application should provide a
    	  positive value for the heap size.  Be aware that there is a
    	  per-allocation overhead that affects how much usable space is
    	  present in the heap.
	  
    	  If this option is set to a non-positive value the heap is sized to
    	  support up to FS_LITTLE_FS_NUM_FILES blocks of
    	  FS_LITTLEFS_CACHE_SIZE bytes.  Until FS_LITTLEFS_FC_MEM_POOL is
    	  removed presence of that option changes the default to support
    	  FS_LITTLEFS_FC_MEM_POOL_NUM_BLOCKS allocations of size
    	  FS_LITTLEFS_MEM_POOL_MAX_SIZE

*(The 'depends on' condition includes propagated dependencies from ifs and menus.)*