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2022-05-10bpf: Add bpf_link iteratorDmitrii Dolgov
Implement bpf_link iterator to traverse links via bpf_seq_file operations. The changeset is mostly shamelessly copied from commit a228a64fc1e4 ("bpf: Add bpf_prog iterator") Signed-off-by: Dmitrii Dolgov <9erthalion6@gmail.com> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/r/20220510155233.9815-2-9erthalion6@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>