1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2020 Facebook */
8 #include <test_progs.h>
10 #define TDIR "/sys/kernel/debug"
12 static int read_iter(char *file)
14 /* 1024 should be enough to get contiguous 4 "iter" letters at some point */
21 while ((len = read(fd, buf, sizeof(buf))) > 0)
22 if (strstr(buf, "iter")) {
32 int err, duration = 0;
34 err = unshare(CLONE_NEWNS);
35 if (CHECK(err, "unshare", "failed: %d\n", errno))
38 err = mount("", "/", "", MS_REC | MS_PRIVATE, NULL);
39 if (CHECK(err, "mount /", "failed: %d\n", errno))
43 if (CHECK(err, "umount " TDIR, "failed: %d\n", errno))
46 err = mount("none", TDIR, "tmpfs", 0, NULL);
47 if (CHECK(err, "mount", "mount root failed: %d\n", errno))
50 err = mkdir(TDIR "/fs1", 0777);
51 if (CHECK(err, "mkdir "TDIR"/fs1", "failed: %d\n", errno))
53 err = mkdir(TDIR "/fs2", 0777);
54 if (CHECK(err, "mkdir "TDIR"/fs2", "failed: %d\n", errno))
57 err = mount("bpf", TDIR "/fs1", "bpf", 0, NULL);
58 if (CHECK(err, "mount bpffs "TDIR"/fs1", "failed: %d\n", errno))
60 err = mount("bpf", TDIR "/fs2", "bpf", 0, NULL);
61 if (CHECK(err, "mount bpffs " TDIR "/fs2", "failed: %d\n", errno))
64 err = read_iter(TDIR "/fs1/maps.debug");
65 if (CHECK(err, "reading " TDIR "/fs1/maps.debug", "failed\n"))
67 err = read_iter(TDIR "/fs2/progs.debug");
68 if (CHECK(err, "reading " TDIR "/fs2/progs.debug", "failed\n"))
79 void test_test_bpffs(void)
81 int err, duration = 0, status = 0;
85 if (CHECK(pid == -1, "clone", "clone failed %d", errno))
89 err = waitpid(pid, &status, 0);
90 if (CHECK(err == -1 && errno != ECHILD, "waitpid", "failed %d", errno))
92 if (CHECK(WEXITSTATUS(status), "bpffs test ", "failed %d", WEXITSTATUS(status)))