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bpf: Convert bpf_prog refcnt to atomic64_t

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Similarly to bpf_map's refcnt/usercnt, convert bpf_prog's refcnt to atomic64
and remove artificial 32k limit. This allows to make bpf_prog's refcounting
non-failing, simplifying logic of users of bpf_prog_add/bpf_prog_inc.

Validated compilation by running allyesconfig kernel build.

Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20191117172806.2195367-3-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2019-11-17 09:28:03 -08:00 • committed by Daniel Borkmann
parent 1e0bd5a091
commit 85192dbf4d
11 changed files with 40 additions and 97 deletions
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5
kernel/bpf/inode.c
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@ -31,7 +31,7 @@ static void *bpf_any_get(void *raw, enum bpf_type type)
{
switch (type) {
case BPF_TYPE_PROG:
raw = bpf_prog_inc(raw);
bpf_prog_inc(raw);
break;
case BPF_TYPE_MAP:
bpf_map_inc_with_uref(raw);
@ -534,7 +534,8 @@ static struct bpf_prog *__get_prog_inode(struct inode *inode, enum bpf_prog_type
if (!bpf_prog_get_ok(prog, &type, false))
return ERR_PTR(-EINVAL);
return bpf_prog_inc(prog);
bpf_prog_inc(prog);
return prog;
}
struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type)