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I’m looking to make a custom filesystem for a project I’m working on. Currently I am looking at writing it in Python combined with fusepy, but it got me wondering how a compiled non-userspace filesystem is made in Linux. Are there specific libraries that you need to work with or functions you need to implement for the mount command to work properly. Overall I’m not sure how the entire process works.
Yup you’d be programming to the kernel interfaces, specifically
the VFS layerat a minimum. Edit Better link [1]‘Full’ documentation is in the kernel tree: http://www.mjmwired.net/kernel/Documentation/filesystems/vfs.txt. Of course, the fuse kernel module is programmed to exactly the same interface
This, however, is not what you’d call a library. It is a kernel component and intrinsically there, so the kernel doesn’t have to know how a filesystem is implemented to work with one.
[1] google was wrong: the first hit wasn’t the best 🙂