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