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libbpf: Add opts-based bpf_obj_pin() API and add support for path_fd

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Add path_fd support for bpf_obj_pin() and bpf_obj_get() operations
(through their opts-based variants). This allows to take advantage of
new kernel-side support for O_PATH-based pin/get location specification.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20230523170013.728457-4-andrii@kernel.org
Signed-off-by: Daniel Müller <deso@posteo.net>
This commit is contained in:
Andrii Nakryiko
2023-05-15 17:01:58 -07:00
committed by Andrii Nakryiko
parent bfb0454244
commit a50544ef45
3 changed files with 32 additions and 5 deletions
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18
src/bpf.h
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@@ -284,16 +284,30 @@ LIBBPF_API int bpf_map_update_batch(int fd, const void *keys, const void *values
__u32 *count,
const struct bpf_map_batch_opts *opts);
struct bpf_obj_pin_opts {
size_t sz; /* size of this struct for forward/backward compatibility */
__u32 file_flags;
int path_fd;
size_t :0;
};
#define bpf_obj_pin_opts__last_field path_fd
LIBBPF_API int bpf_obj_pin(int fd, const char *pathname);
LIBBPF_API int bpf_obj_pin_opts(int fd, const char *pathname,
const struct bpf_obj_pin_opts *opts);
struct bpf_obj_get_opts {
size_t sz; /* size of this struct for forward/backward compatibility */
__u32 file_flags;
int path_fd;
size_t :0;
};
#define bpf_obj_get_opts__last_field file_flags
#define bpf_obj_get_opts__last_field path_fd
LIBBPF_API int bpf_obj_pin(int fd, const char *pathname);
LIBBPF_API int bpf_obj_get(const char *pathname);
LIBBPF_API int bpf_obj_get_opts(const char *pathname,
const struct bpf_obj_get_opts *opts);