Kconfig

config BFCFS
	tristate "BFC image filesystem (read-only)"
	depends on ZSTD_DECOMPRESS && CRYPTO && CRYPTO_AEAD && CRC32
	select CRYPTO_CHACHA20POLY1305
	help
	  Mount .bfc single-file images via a native filesystem (no FUSE).
	  
	  BFC (Binary File Container) is a high-performance, single-file
	  container format that supports compression (Zstd) and encryption 
	  (ChaCha20-Poly1305). This filesystem allows mounting BFC containers
	  directly in the kernel with O(log N) file lookups.
	  
	  Features:
	  - Read-only mounting of .bfc containers
	  - Zstd decompression support
	  - ChaCha20-Poly1305 AEAD encryption/decryption
	  - Kernel keyring integration for encryption keys
	  - Fast random access with sorted index
	  - POSIX metadata preservation
	  
	  If unsure, say N.