The Be operating system file system, known simply as BFS, is the file system for the Haiku, BeOS, and SkyOS operating systems. When it was created in the late '90s as part of the ill-fated BeOS ...

There's the user interface layer; the file system implementation; and the storage device drivers. Within the Linux kernel's seq_file interface produces virtual files containing sequences of records.

Plus, as a bonus, the interface allows for handy over-the-air firmware updates. One need only export a compiled binary from the Arduino IDE, and then load the resulting *.bin file into the ESP32 ...