HelenOS sources

EXT4_MIN_BLOCK_SIZE  247 uspace/lib/ext4/src/superblock.c 	uint32_t tmp = size / EXT4_MIN_BLOCK_SIZE;
EXT4_MIN_BLOCK_SIZE  303 uspace/lib/ext4/src/superblock.c 	uint32_t tmp = size / EXT4_MIN_BLOCK_SIZE;
HelenOS homepage, sources at GitHub