bpf: add show_fdinfo handler for maps
Add a handler for show_fdinfo() to be used by the anon-inodes backend for eBPF maps, and dump the map specification there. Not only useful for admins, but also it provides a minimal way to compare specs from ELF vs pinned object. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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