IOUringFilter= takes the names of io_uring operations, and SystemCallFilter= denies an operation if it denies one of the system calls that the operation can do the work of. Users can only find the operation names and the system calls of each operation in the source code. Let's add "systemd-analyze io-uring-filter", which lists the operations that systemd knows, together with the system calls of each operation, like "systemd-analyze syscall-filter" does for the system call groups.
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