1// SPDX-License-Identifier: GPL-2.0 2/* Copyright (c) 2020 Facebook */ 3#define _GNU_SOURCE 4#include <stdio.h> 5#include <sched.h> 6#include <sys/mount.h> 7#include <sys/stat.h> 8#include <sys/types.h> 9#include <test_progs.h> 10 11/* TDIR must be in a location we can create a directory in. */ 12#define TDIR "/tmp/test_bpffs_testdir" 13 14static int read_iter(char *file) 15{ 16 /* 1024 should be enough to get contiguous 4 "iter" letters at some point */ 17 char buf[1024]; 18 int fd, len; 19 20 fd = open(file, 0); 21 if (fd < 0) 22 return -1; 23 while ((len = read(fd, buf, sizeof(buf))) > 0) { 24 buf[sizeof(buf) - 1] = '\0'; 25 if (strstr(buf, "iter")) { 26 close(fd); 27 return 0; 28 } 29 } 30 close(fd); 31 return -1; 32} 33 34static int fn(void) 35{ 36 struct stat a, b, c; 37 int err, map; 38 39 err = unshare(CLONE_NEWNS); 40 if (!ASSERT_OK(err, "unshare")) 41 goto out; 42 43 err = mount("", "/", "", MS_REC | MS_PRIVATE, NULL); 44 if (!ASSERT_OK(err, "mount /")) 45 goto out; 46 47 err = mkdir(TDIR, 0777); 48 /* If the directory already exists we can carry on. It may be left over 49 * from a previous run. 50 */ 51 if ((err && errno != EEXIST) && !ASSERT_OK(err, "mkdir " TDIR)) 52 goto out; 53 54 err = mount("none", TDIR, "tmpfs", 0, NULL); 55 if (!ASSERT_OK(err, "mount tmpfs")) 56 goto out; 57 58 err = mkdir(TDIR "/fs1", 0777); 59 if (!ASSERT_OK(err, "mkdir " TDIR "/fs1")) 60 goto out; 61 err = mkdir(TDIR "/fs2", 0777); 62 if (!ASSERT_OK(err, "mkdir " TDIR "/fs2")) 63 goto out; 64 65 err = mount("bpf", TDIR "/fs1", "bpf", 0, NULL); 66 if (!ASSERT_OK(err, "mount bpffs " TDIR "/fs1")) 67 goto out; 68 err = mount("bpf", TDIR "/fs2", "bpf", 0, NULL); 69 if (!ASSERT_OK(err, "mount bpffs " TDIR "/fs2")) 70 goto out; 71 72 err = read_iter(TDIR "/fs1/maps.debug"); 73 if (!ASSERT_OK(err, "reading " TDIR "/fs1/maps.debug")) 74 goto out; 75 err = read_iter(TDIR "/fs2/progs.debug"); 76 if (!ASSERT_OK(err, "reading " TDIR "/fs2/progs.debug")) 77 goto out; 78 79 err = mkdir(TDIR "/fs1/a", 0777); 80 if (!ASSERT_OK(err, "creating " TDIR "/fs1/a")) 81 goto out; 82 err = mkdir(TDIR "/fs1/a/1", 0777); 83 if (!ASSERT_OK(err, "creating " TDIR "/fs1/a/1")) 84 goto out; 85 err = mkdir(TDIR "/fs1/b", 0777); 86 if (!ASSERT_OK(err, "creating " TDIR "/fs1/b")) 87 goto out; 88 89 map = bpf_map_create(BPF_MAP_TYPE_ARRAY, NULL, 4, 4, 1, NULL); 90 if (!ASSERT_GT(map, 0, "create_map(ARRAY)")) 91 goto out; 92 err = bpf_obj_pin(map, TDIR "/fs1/c"); 93 if (!ASSERT_OK(err, "pin map")) 94 goto out; 95 close(map); 96 97 /* Check that RENAME_EXCHANGE works for directories. */ 98 err = stat(TDIR "/fs1/a", &a); 99 if (!ASSERT_OK(err, "stat(" TDIR "/fs1/a)")) 100 goto out; 101 err = renameat2(0, TDIR "/fs1/a", 0, TDIR "/fs1/b", RENAME_EXCHANGE); 102 if (!ASSERT_OK(err, "renameat2(/fs1/a, /fs1/b, RENAME_EXCHANGE)")) 103 goto out; 104 err = stat(TDIR "/fs1/b", &b); 105 if (!ASSERT_OK(err, "stat(" TDIR "/fs1/b)")) 106 goto out; 107 if (!ASSERT_EQ(a.st_ino, b.st_ino, "b should have a's inode")) 108 goto out; 109 err = access(TDIR "/fs1/b/1", F_OK); 110 if (!ASSERT_OK(err, "access(" TDIR "/fs1/b/1)")) 111 goto out; 112 113 /* Check that RENAME_EXCHANGE works for mixed file types. */ 114 err = stat(TDIR "/fs1/c", &c); 115 if (!ASSERT_OK(err, "stat(" TDIR "/fs1/map)")) 116 goto out; 117 err = renameat2(0, TDIR "/fs1/c", 0, TDIR "/fs1/b", RENAME_EXCHANGE); 118 if (!ASSERT_OK(err, "renameat2(/fs1/c, /fs1/b, RENAME_EXCHANGE)")) 119 goto out; 120 err = stat(TDIR "/fs1/b", &b); 121 if (!ASSERT_OK(err, "stat(" TDIR "/fs1/b)")) 122 goto out; 123 if (!ASSERT_EQ(c.st_ino, b.st_ino, "b should have c's inode")) 124 goto out; 125 err = access(TDIR "/fs1/c/1", F_OK); 126 if (!ASSERT_OK(err, "access(" TDIR "/fs1/c/1)")) 127 goto out; 128 129 /* Check that RENAME_NOREPLACE works. */ 130 err = renameat2(0, TDIR "/fs1/b", 0, TDIR "/fs1/a", RENAME_NOREPLACE); 131 if (!ASSERT_ERR(err, "renameat2(RENAME_NOREPLACE)")) { 132 err = -EINVAL; 133 goto out; 134 } 135 err = access(TDIR "/fs1/b", F_OK); 136 if (!ASSERT_OK(err, "access(" TDIR "/fs1/b)")) 137 goto out; 138 139out: 140 umount(TDIR "/fs1"); 141 umount(TDIR "/fs2"); 142 rmdir(TDIR "/fs1"); 143 rmdir(TDIR "/fs2"); 144 umount(TDIR); 145 rmdir(TDIR); 146 exit(err); 147} 148 149void test_test_bpffs(void) 150{ 151 int err, duration = 0, status = 0; 152 pid_t pid; 153 154 pid = fork(); 155 if (CHECK(pid == -1, "clone", "clone failed %d", errno)) 156 return; 157 if (pid == 0) 158 fn(); 159 err = waitpid(pid, &status, 0); 160 if (CHECK(err == -1 && errno != ECHILD, "waitpid", "failed %d", errno)) 161 return; 162 if (CHECK(WEXITSTATUS(status), "bpffs test ", "failed %d", WEXITSTATUS(status))) 163 return; 164} 165