bfs_super_block
struct bfs_super_block *bfs = (void *)buf;
struct bfs_super_block super;
bfs->max_inode = (bfs->data_start - sizeof(struct bfs_super_block)) /
bfs->super_block = (struct bfs_super_block *)p;
bfs->inode = (struct bfs_inode *)(p + sizeof(struct bfs_super_block));
bfs_superblock_valid(const struct bfs_super_block *super)
STATIC bool bfs_superblock_valid(const struct bfs_super_block *);
struct bfs_super_block *super_block;