The libfuse github has some good examples for C/C++ in [0] of increasing complexity:
- passthrough.c mirrors existing filesystem, "Its performance is terrible."
- passthrough_fh.c "performance is not quite as bad."
- passthrough_ll.c implemented with low level api and "the least bad among the three"
- passthrough_hp.cc high performance version written in C++
Some interesting fuse projects in my notes: [1] splitting large files into segments; [2] show ZFS incremental snapshots as files; [3] transparent filesystem compression; [4] and [5] options for mounting archives as filesytems.
- [0] https://github.com/libfuse/libfuse/tree/master/example
- [1] https://github.com/seiferma/splitviewfuse
- [2] https://github.com/UNFmontreal/zfs_fuse_snapshot
- [3] https://github.com/FS-make-simple/fusecompress