[$] Tracing the source of filesystem errors

There are lots of places in the kernel where an EINVAL can bereturned to user space, but it is often unclear what the actual underlyingproblem is because the errnoerror codes are too generic. That is the problem that Miklos Szerediwanted to discuss in a filesystem session that he led remotely at the 2024 Linux Storage,Filesystem, Memory Management, and BPF Summit. He would like to helpthose who are trying to debug problems trace where in the kernel aparticular error code is being generated.