Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2
3#include <sys/types.h>
4#include <sys/stat.h>
5#include <unistd.h>
6#include <test_progs.h>
7
8
9#include "test_pinning_devmap.skel.h"
10
11void test_pinning_devmap_reuse(void)
12{
13 const char *pinpath1 = "/sys/fs/bpf/pinmap1";
14 const char *pinpath2 = "/sys/fs/bpf/pinmap2";
15 struct test_pinning_devmap *skel1 = NULL, *skel2 = NULL;
16 int err;
17 DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts);
18
19 /* load the object a first time */
20 skel1 = test_pinning_devmap__open_and_load();
21 if (!ASSERT_OK_PTR(skel1, "skel_load1"))
22 goto out;
23
24 /* load the object a second time, re-using the pinned map */
25 skel2 = test_pinning_devmap__open_and_load();
26 if (!ASSERT_OK_PTR(skel2, "skel_load2"))
27 goto out;
28
29 /* we can close the reference safely without
30 * the map's refcount falling to 0
31 */
32 test_pinning_devmap__destroy(skel1);
33 skel1 = NULL;
34
35 /* now, swap the pins */
36 err = renameat2(0, pinpath1, 0, pinpath2, RENAME_EXCHANGE);
37 if (!ASSERT_OK(err, "swap pins"))
38 goto out;
39
40 /* load the object again, this time the re-use should fail */
41 skel1 = test_pinning_devmap__open_and_load();
42 if (!ASSERT_ERR_PTR(skel1, "skel_load3"))
43 goto out;
44
45out:
46 unlink(pinpath1);
47 unlink(pinpath2);
48 test_pinning_devmap__destroy(skel1);
49 test_pinning_devmap__destroy(skel2);
50}