On 2/11/22 1:43 PM, Daniel Borkmann wrote:
On 2/11/22 1:11 PM, Yafang Shao wrote:A new member pin_name is added into struct bpf_prog_aux, which will be set when the prog is set and cleared when the pinned file is removed. Signed-off-by: Yafang Shao <laoar.shao@xxxxxxxxx> --- include/linux/bpf.h | 2 ++ include/uapi/linux/bpf.h | 1 + kernel/bpf/inode.c | 20 +++++++++++++++++++- 3 files changed, 22 insertions(+), 1 deletion(-) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 0ceb25b..9cf8055 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -933,6 +933,8 @@ struct bpf_prog_aux { struct work_struct work; struct rcu_head rcu; }; + + char pin_name[BPF_PIN_NAME_LEN]; };I'm afraid this is not possible. You are assuming a 1:1 relationship between prog and pin location, but it's really a 1:n (prog can be pinned in multiple locations and also across multiple mount instances). Also, you can create hard links of pins which are not handled via bpf_obj_do_pin().
(Same is also true for BPF maps wrt patch 2.)
