This is a compatibility layer for the older mount APIs, for file system drivers hat don't utilize the newer API yet. The newer mount API is called `fs_context`

This is a compatibility layer for the older mount APIs, for file system drivers hat don't utilize the newer API yet. The newer mount API is called `fs_context`, and you can read the LWN article about it here: https://lwn.net/Articles/780267/ https://lwn.net/Articles/780267/ ["VFS: Introduce filesystem context"]