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authorRoman Gushchin <guro@fb.com>2018-08-02 14:27:18 -0700
committerDaniel Borkmann <daniel@iogearbox.net>2018-08-03 00:47:32 +0200
commitde9cbbaadba5adf88a19e46df61f7054000838f6 (patch)
tree6cfafffa94b145c7d4e0e986a75178262c843385 /kernel/bpf/syscall.c
parent0a4c58f5702858822621fa1177c7d3475f181ccb (diff)
downloadlinux-de9cbbaadba5adf88a19e46df61f7054000838f6.tar.bz2
bpf: introduce cgroup storage maps
This commit introduces BPF_MAP_TYPE_CGROUP_STORAGE maps: a special type of maps which are implementing the cgroup storage. >From the userspace point of view it's almost a generic hash map with the (cgroup inode id, attachment type) pair used as a key. The only difference is that some operations are restricted: 1) a user can't create new entries, 2) a user can't remove existing entries. The lookup from userspace is o(log(n)). Signed-off-by: Roman Gushchin <guro@fb.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'kernel/bpf/syscall.c')
-rw-r--r--kernel/bpf/syscall.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 7958252a4d29..5af4e9e2722d 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -957,6 +957,9 @@ static void free_used_maps(struct bpf_prog_aux *aux)
{
int i;
+ if (aux->cgroup_storage)
+ bpf_cgroup_storage_release(aux->prog, aux->cgroup_storage);
+
for (i = 0; i < aux->used_map_cnt; i++)
bpf_map_put(aux->used_maps[i]);