// SPDX-License-Identifier: GPL-2.0 #include <sys/types.h> #include <sys/stat.h> #include <unistd.h> #include <test_progs.h> #include "test_pinning_devmap.skel.h" void test_pinning_devmap_reuse(void) { const char *pinpath1 = "/sys/fs/bpf/pinmap1"; const char *pinpath2 = "/sys/fs/bpf/pinmap2"; struct test_pinning_devmap *skel1 = NULL, *skel2 = NULL; int err; DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts); /* load the object a first time */ skel1 = test_pinning_devmap__open_and_load(); if (!ASSERT_OK_PTR(skel1, "skel_load1")) goto out; /* load the object a second time, re-using the pinned map */ skel2 = test_pinning_devmap__open_and_load(); if (!ASSERT_OK_PTR(skel2, "skel_load2")) goto out; /* we can close the reference safely without * the map's refcount falling to 0 */ test_pinning_devmap__destroy(skel1); skel1 = NULL; /* now, swap the pins */ err = renameat2(0, pinpath1, 0, pinpath2, RENAME_EXCHANGE); if (!ASSERT_OK(err, "swap pins")) goto out; /* load the object again, this time the re-use should fail */ skel1 = test_pinning_devmap__open_and_load(); if (!ASSERT_ERR_PTR(skel1, "skel_load3")) goto out; out: unlink(pinpath1); unlink(pinpath2); test_pinning_devmap__destroy(skel1); test_pinning_devmap__destroy(skel2); }