HelenOS sources

fat_bs_t          135 uspace/app/mkfat/fat.h } __attribute__((packed)) fat_bs_t;
fat_bs_t          135 uspace/lib/label/include/std/fat.h } __attribute__((packed)) fat_bs_t;
fat_bs_t          153 uspace/srv/fs/fat/fat.h } __attribute__((packed)) fat_bs_t;
HelenOS homepage, sources at GitHub