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bpf: Refactor bpf_link update handling

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Make bpf_link update support more generic by making it into another
bpf_link_ops methods. This allows generic syscall handling code to be agnostic
to various conditionally compiled features (e.g., the case of
CONFIG_CGROUP_BPF). This also allows to keep link type-specific code to remain
static within respective code base. Refactor existing bpf_cgroup_link code and
take advantage of this.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200429001614.1544-2-andriin@fb.com
This commit is contained in:
Andrii Nakryiko
2020-04-28 17:16:05 -07:00
committed by Alexei Starovoitov
parent 9b329d0dbe
commit f9d041271c
5 changed files with 34 additions and 49 deletions
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include/linux/bpf.h
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@@ -1093,7 +1093,8 @@ struct bpf_link {
struct bpf_link_ops {
void (*release)(struct bpf_link *link);
void (*dealloc)(struct bpf_link *link);
int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
struct bpf_prog *old_prog);
};
void bpf_link_init(struct bpf_link *link, const struct bpf_link_ops *ops,