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authorToke Høiland-Jørgensen <toke@redhat.com>2019-11-09 21:37:27 +0100
committerAlexei Starovoitov <ast@kernel.org>2019-11-10 19:26:30 -0800
commitec6d5f47bfe36f46aa0de707e5beb2f58d96b76d (patch)
treef9bb7944a22d5e60f867ba88a18fa721d9562e92 /tools/lib
parent451d1dc886b548d6e18c933adca326c1307023c9 (diff)
libbpf: Unpin auto-pinned maps if loading fails
Since the automatic map-pinning happens during load, it will leave pinned maps around if the load fails at a later stage. Fix this by unpinning any pinned maps on cleanup. To avoid unpinning pinned maps that were reused rather than newly pinned, add a new boolean property on struct bpf_map to keep track of whether that map was reused or not; and only unpin those maps that were not reused. Fixes: 57a00f41644f ("libbpf: Add auto-pinning of maps when loading BPF objects") Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Song Liu <songliubraving@fb.com> Link: https://lore.kernel.org/bpf/157333184731.88376.9992935027056165873.stgit@toke.dk
Diffstat (limited to 'tools/lib')
-rw-r--r--tools/lib/bpf/libbpf.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index fde6cb3e5d41..d8ead85903d1 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -229,6 +229,7 @@ struct bpf_map {
enum libbpf_map_type libbpf_type;
char *pin_path;
bool pinned;
+ bool reused;
};
struct bpf_secdata {
@@ -1995,6 +1996,7 @@ int bpf_map__reuse_fd(struct bpf_map *map, int fd)
map->def.map_flags = info.map_flags;
map->btf_key_type_id = info.btf_key_type_id;
map->btf_value_type_id = info.btf_value_type_id;
+ map->reused = true;
return 0;
@@ -4026,7 +4028,7 @@ int bpf_object__unload(struct bpf_object *obj)
int bpf_object__load_xattr(struct bpf_object_load_attr *attr)
{
struct bpf_object *obj;
- int err;
+ int err, i;
if (!attr)
return -EINVAL;
@@ -4047,6 +4049,11 @@ int bpf_object__load_xattr(struct bpf_object_load_attr *attr)
return 0;
out:
+ /* unpin any maps that were auto-pinned during load */
+ for (i = 0; i < obj->nr_maps; i++)
+ if (obj->maps[i].pinned && !obj->maps[i].reused)
+ bpf_map__unpin(&obj->maps[i], NULL);
+
bpf_object__unload(obj);
pr_warn("failed to load object '%s'\n", obj->path);
return err;