fs: remove NFFS subsystem

NFFS is removed as it has serious bugs (by design) which haven't
been resolved since extended range of time.
One of most serious issues bunch were described here:
apache/mynewt-nffs#10

Since lack of support NFFS upsterem it doesn't make sense to keep
it in zephyr.

Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>

include/fs/fs.h

@@ -47,7 +47,6 @@ enum fs_dir_entry_type {
 
 enum fs_type {
 	FS_FATFS = 0,
-	FS_NFFS,
 	FS_LITTLEFS,
 	FS_TYPE_END,
 };

include/fs/fs_interface.h

@@ -11,7 +11,7 @@
 extern "C" {
 #endif
 
-#if defined(CONFIG_FILE_SYSTEM_LITTLEFS) || defined(CONFIG_FILE_SYSTEM_NFFS)
+#if defined(CONFIG_FILE_SYSTEM_LITTLEFS)
 #define MAX_FILE_NAME 256
 #else /* FAT_FS */
 #define MAX_FILE_NAME 12 /* Uses 8.3 SFN */

subsys/fs/CMakeLists.txt

@@ -8,14 +8,12 @@ if(CONFIG_FILE_SYSTEM)
   zephyr_library_sources(fs.c fs_impl.c)
   zephyr_library_sources_ifdef(CONFIG_FAT_FILESYSTEM_ELM   fat_fs.c)
   zephyr_library_sources_ifdef(CONFIG_FILE_SYSTEM_LITTLEFS littlefs_fs.c)
-  zephyr_library_sources_ifdef(CONFIG_FILE_SYSTEM_NFFS     nffs_fs.c)
   zephyr_library_sources_ifdef(CONFIG_FILE_SYSTEM_SHELL    shell.c)
 
   zephyr_library_link_libraries(FS)
 
   target_link_libraries_ifdef(CONFIG_FAT_FILESYSTEM_ELM   FS INTERFACE ELMFAT)
   target_link_libraries_ifdef(CONFIG_FILE_SYSTEM_LITTLEFS FS INTERFACE LITTLEFS)
-  target_link_libraries_ifdef(CONFIG_FILE_SYSTEM_NFFS     FS INTERFACE NFFS)
 endif()
 
 add_subdirectory_ifdef(CONFIG_FCB  ./fcb)

subsys/fs/Kconfig

@@ -28,14 +28,6 @@ config FAT_FILESYSTEM_ELM
 	help
 	  Use the ELM FAT File system implementation.
 
-config FILE_SYSTEM_NFFS
-	bool "NFFS file system support"
-	depends on FLASH_PAGE_LAYOUT
-	help
-	  Enables NFFS file system support.
-	  Note: NFFS requires 1-byte unaligned access to flash thus it
-	  will not work on devices that support only aligned flash access.
-
 config FILE_SYSTEM_LITTLEFS
 	bool "LittleFS file system support"
 	depends on FLASH_MAP
@@ -69,62 +61,6 @@ config FS_FATFS_NUM_DIRS
 	default 4
 endmenu
 
-menu "NFFS Settings"
-	visible if FILE_SYSTEM_NFFS
-
-config FS_NFFS_FLASH_DEV_NAME
-	string "Flash device name to be used"
-
-config FS_NFFS_NUM_INODES
-	int "Maximum number of inodes"
-	range 1 32768
-	default 100
-
-config FS_NFFS_NUM_BLOCKS
-	int "Maximum number of blocks"
-	range 1 32768
-	default 100
-
-config FS_NFFS_NUM_FILES
-	int "Maximum number of opened files"
-	range 1 256
-	default 4
-
-config FS_NFFS_NUM_DIRS
-	int "Maximum number of opened directories"
-	range 1 256
-	default 4
-
-config FS_NFFS_NUM_CACHE_INODES
-	int "Number of cached files' inodes"
-	range 1 512
-	default 4
-
-config FS_NFFS_NUM_CACHE_BLOCKS
-	int "Number of cached blocks"
-	range 1 512
-	default 64
-
-config NFFS_FILESYSTEM_MAX_AREAS
-	int "Maximum number of areas"
-	range 2 64
-	default 8
-	help
-	  This defines maximum number of areas located on flash. Each area can
-	  be erased without affecting other areas thus the size of area can
-	  affect performance of GC where single area has to be rewritten.
-	  At least one scratch and one non-scratch area is required.
-
-config NFFS_FILESYSTEM_MAX_BLOCK_SIZE
-	int "Maximum block size"
-	range 16 2048
-	default 2048
-	help
-	  This determines the maximum size of data block written to flash.
-	  Writes larger than this size are split into multiple write operations.
-
-endmenu
-
 source "subsys/fs/Kconfig.littlefs"
 
 endif # FILE_SYSTEM