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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#define _GNU_SOURCE
#include <stdio.h>
#include <sched.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <test_progs.h>
#define TDIR "/sys/kernel/debug"
static int read_iter(char *file)
{
/* 1024 should be enough to get contiguous 4 "iter" letters at some point */
char buf[1024];
int fd, len;
fd = open(file, 0);
if (fd < 0)
return -1;
while ((len = read(fd, buf, sizeof(buf))) > 0) {
buf[sizeof(buf) - 1] = '\0';
if (strstr(buf, "iter")) {
close(fd);
return 0;
}
}
close(fd);
return -1;
}
static int fn(void)
{
struct stat a, b, c;
int err, map;
err = unshare(CLONE_NEWNS);
if (!ASSERT_OK(err, "unshare"))
goto out;
err = mount("", "/", "", MS_REC | MS_PRIVATE, NULL);
if (!ASSERT_OK(err, "mount /"))
goto out;
err = umount(TDIR);
if (!ASSERT_OK(err, "umount " TDIR))
goto out;
err = mount("none", TDIR, "tmpfs", 0, NULL);
if (!ASSERT_OK(err, "mount tmpfs"))
goto out;
err = mkdir(TDIR "/fs1", 0777);
if (!ASSERT_OK(err, "mkdir " TDIR "/fs1"))
goto out;
err = mkdir(TDIR "/fs2", 0777);
if (!ASSERT_OK(err, "mkdir " TDIR "/fs2"))
goto out;
err = mount("bpf", TDIR "/fs1", "bpf", 0, NULL);
if (!ASSERT_OK(err, "mount bpffs " TDIR "/fs1"))
goto out;
err = mount("bpf", TDIR "/fs2", "bpf", 0, NULL);
if (!ASSERT_OK(err, "mount bpffs " TDIR "/fs2"))
goto out;
err = read_iter(TDIR "/fs1/maps.debug");
if (!ASSERT_OK(err, "reading " TDIR "/fs1/maps.debug"))
goto out;
err = read_iter(TDIR "/fs2/progs.debug");
if (!ASSERT_OK(err, "reading " TDIR "/fs2/progs.debug"))
goto out;
err = mkdir(TDIR "/fs1/a", 0777);
if (!ASSERT_OK(err, "creating " TDIR "/fs1/a"))
goto out;
err = mkdir(TDIR "/fs1/a/1", 0777);
if (!ASSERT_OK(err, "creating " TDIR "/fs1/a/1"))
goto out;
err = mkdir(TDIR "/fs1/b", 0777);
if (!ASSERT_OK(err, "creating " TDIR "/fs1/b"))
goto out;
map = bpf_map_create(BPF_MAP_TYPE_ARRAY, NULL, 4, 4, 1, NULL);
if (!ASSERT_GT(map, 0, "create_map(ARRAY)"))
goto out;
err = bpf_obj_pin(map, TDIR "/fs1/c");
if (!ASSERT_OK(err, "pin map"))
goto out;
close(map);
/* Check that RENAME_EXCHANGE works for directories. */
err = stat(TDIR "/fs1/a", &a);
if (!ASSERT_OK(err, "stat(" TDIR "/fs1/a)"))
goto out;
err = renameat2(0, TDIR "/fs1/a", 0, TDIR "/fs1/b", RENAME_EXCHANGE);
if (!ASSERT_OK(err, "renameat2(/fs1/a, /fs1/b, RENAME_EXCHANGE)"))
goto out;
err = stat(TDIR "/fs1/b", &b);
if (!ASSERT_OK(err, "stat(" TDIR "/fs1/b)"))
goto out;
if (!ASSERT_EQ(a.st_ino, b.st_ino, "b should have a's inode"))
goto out;
err = access(TDIR "/fs1/b/1", F_OK);
if (!ASSERT_OK(err, "access(" TDIR "/fs1/b/1)"))
goto out;
/* Check that RENAME_EXCHANGE works for mixed file types. */
err = stat(TDIR "/fs1/c", &c);
if (!ASSERT_OK(err, "stat(" TDIR "/fs1/map)"))
goto out;
err = renameat2(0, TDIR "/fs1/c", 0, TDIR "/fs1/b", RENAME_EXCHANGE);
if (!ASSERT_OK(err, "renameat2(/fs1/c, /fs1/b, RENAME_EXCHANGE)"))
goto out;
err = stat(TDIR "/fs1/b", &b);
if (!ASSERT_OK(err, "stat(" TDIR "/fs1/b)"))
goto out;
if (!ASSERT_EQ(c.st_ino, b.st_ino, "b should have c's inode"))
goto out;
err = access(TDIR "/fs1/c/1", F_OK);
if (!ASSERT_OK(err, "access(" TDIR "/fs1/c/1)"))
goto out;
/* Check that RENAME_NOREPLACE works. */
err = renameat2(0, TDIR "/fs1/b", 0, TDIR "/fs1/a", RENAME_NOREPLACE);
if (!ASSERT_ERR(err, "renameat2(RENAME_NOREPLACE)")) {
err = -EINVAL;
goto out;
}
err = access(TDIR "/fs1/b", F_OK);
if (!ASSERT_OK(err, "access(" TDIR "/fs1/b)"))
goto out;
out:
umount(TDIR "/fs1");
umount(TDIR "/fs2");
rmdir(TDIR "/fs1");
rmdir(TDIR "/fs2");
umount(TDIR);
exit(err);
}
void test_test_bpffs(void)
{
int err, duration = 0, status = 0;
pid_t pid;
pid = fork();
if (CHECK(pid == -1, "clone", "clone failed %d", errno))
return;
if (pid == 0)
fn();
err = waitpid(pid, &status, 0);
if (CHECK(err == -1 && errno != ECHILD, "waitpid", "failed %d", errno))
return;
if (CHECK(WEXITSTATUS(status), "bpffs test ", "failed %d", WEXITSTATUS(status)))
return;
}
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