[erlang-questions] locking caveats in file module

[Max Lapshin]

async thread pool cannot help filelib:ensure_dir, because this library
method is using only global singleton file server.

Customer has mounted NFS and thus file_server_1 is blocked waiting for lost
UDP packet.


We have moved almost all file:read_file_info to explicit opening port and
calling not via singleton, but via separate port, but filelib:ensure_dir is
using singleton process.
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