bpf: net: Avoid sk_getsockopt() taking sk lock when called from bpf
Similar to the earlier commit that changed sk_setsockopt() to use sockopt_{lock,release}_sock() such that it can avoid taking lock when called from bpf. This patch also changes sk_getsockopt() to use sockopt_{lock,release}_sock() such that a latter patch can make bpf_getsockopt(SOL_SOCKET) to reuse sk_getsockopt(). Only sk_get_filter() requires this change and it is used by the optname SO_GET_FILTER. The '.getname' implementations in sock->ops->getname() is not changed also since bpf does not always have the sk->sk_socket pointer and cannot support SO_PEERNAME. Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org> Link: https://lore.kernel.org/r/20220902002809.2888981-1-kafai@fb.comSigned-off-by: Alexei Starovoitov <ast@kernel.org>
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