在Linux中访问bio struct的缓冲区数据

I am working on a Linux kernel module that requires me to check data right before it is written to a local disk. The data to be written is fetched from a remote disk. Therefore, I know that the data from the fetch is stored in the page cache. I also know that Linux has a data structure that manages block I/O requests in-flight called the bio struct. I am working on a Linux kernel module that requ