BFS_BSIZE_BITS
block = BFS_I(dir)->i_sblock + (ctx->pos >> BFS_BSIZE_BITS);
info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
#define BFS_BSIZE (1<<BFS_BSIZE_BITS)