title: Linux Kernel - Where in the kernel are blocks of data physically written to specific disk partitions?
body: <p>I'm modifying the Linux kernel and am trying to find where in the kernel source blocks of data are physically written to disk partitions such as ubd0. Where does this occur in kernel source? The actual physical write call? I cannot find this. Thanks!</p>
  
  <p>Edit: The end goal is a list of block numbers that have been written to a few different partitions. As data is physically written to the list, the block numbers written are returned and maintained.</p>