[PATCHv2,0/3] Fix pining maps after reuse map fd

Message

Hangbin Liu Oct. 3, 2020, 8:55 a.m. UTC

When a user reuse map fd after creating a map manually and set the
pin_path, then load the object via libbpf. bpf_object__create_maps()
will skip pinning map if map fd exist. Fix it by add moving bpf creation
to else condition and go on checking map pin_path after that.

v2:
a) close map fd if init map slots failed
b) add bpf selftest for this scenario

Hangbin Liu (3):
  libbpf: close map fd if init map slots failed
  libbpf: check if pin_path was set even map fd exist
  selftest/bpf: test pinning map with reused map fd

 tools/lib/bpf/libbpf.c                        | 80 +++++++++++--------
 .../selftests/bpf/prog_tests/pinning.c        | 46 ++++++++++-
 2 files changed, 91 insertions(+), 35 deletions(-)