hi, adding d_path helper function that returns full path for given 'struct path' object, which needs to be the kernel BTF 'path' object. The path is returned in buffer provided 'buf' of size 'sz' and is zero terminated. int bpf_d_path(struct path *path, char *buf, u32 sz); The helper calls directly d_path function, so there's only limited set of function it can be called from. The patchset also adds support to add set of BTF IDs for a helper to define functions that the helper is allowed to be called from. Also available at: https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git bpf/d_path v8 changes: - rebased on Yonghong's latest changes - factored btf_struct_access function [Andrii] - fixed leftovers fro mthe preparation changes thanks, jirka --- Jiri Olsa (13): selftests/bpf: Fix resolve_btfids test tools resolve_btfids: Add support for set symbols bpf: Move btf_resolve_size into __btf_resolve_size bpf: Add elem_id pointer as argument to __btf_resolve_size bpf: Add type_id pointer as argument to __btf_resolve_size bpf: Factor btf_struct_access function bpf: Add btf_struct_ids_match function bpf: Add BTF_SET_START/END macros bpf: Add d_path helper bpf: Update .BTF_ids section in btf.rst with sets info selftests/bpf: Add verifier test for d_path helper selftests/bpf: Add test for d_path helper selftests/bpf: Add set test to resolve_btfids Documentation/bpf/btf.rst | 25 +++++++++++++++ include/linux/bpf.h | 6 ++++ include/linux/btf.h | 3 +- include/linux/btf_ids.h | 43 ++++++++++++++++++++++++- include/uapi/linux/bpf.h | 13 ++++++++ kernel/bpf/bpf_struct_ops.c | 6 ++-- kernel/bpf/btf.c | 148 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------------- kernel/bpf/verifier.c | 23 ++++++++++---- kernel/trace/bpf_trace.c | 48 ++++++++++++++++++++++++++++ scripts/bpf_helpers_doc.py | 2 ++ tools/bpf/resolve_btfids/main.c | 15 ++++++++- tools/include/linux/btf_ids.h | 43 ++++++++++++++++++++++++- tools/include/uapi/linux/bpf.h | 13 ++++++++ tools/testing/selftests/bpf/prog_tests/d_path.c | 162 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ tools/testing/selftests/bpf/prog_tests/resolve_btfids.c | 34 ++++++++++++++++++++ tools/testing/selftests/bpf/progs/test_d_path.c | 64 ++++++++++++++++++++++++++++++++++++++ tools/testing/selftests/bpf/test_verifier.c | 19 +++++++++++- tools/testing/selftests/bpf/verifier/d_path.c | 37 ++++++++++++++++++++++ 18 files changed, 667 insertions(+), 37 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/d_path.c create mode 100644 tools/testing/selftests/bpf/progs/test_d_path.c create mode 100644 tools/testing/selftests/bpf/verifier/d_path.c
