| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * Copyright (C) 2010-2022 Tuxera Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <dirent.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include <linux/fs.h> |
| #include <sys/ioctl.h> |
| #include <sys/mman.h> |
| #include <sys/mount.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| |
| #include <linux/kdev_t.h> |
| |
| #define LOG_TAG "Vold::Apfs" |
| |
| #include <android-base/logging.h> |
| #include <android-base/stringprintf.h> |
| #include <selinux/selinux.h> |
| |
| #include <logwrap/logwrap.h> |
| |
| #include "Utils.h" |
| #include "Apfs.h" |
| #include "VoldUtil.h" |
| |
| using android::base::StringPrintf; |
| |
| namespace android { |
| namespace vold { |
| namespace apfs { |
| |
| status_t Detect(const std::string& source, bool *outResult) { |
| const char *const fsPath = source.c_str(); |
| |
| int retval = -1; |
| |
| int fd = open(fsPath, O_RDONLY | O_CLOEXEC); |
| if (fd != -1) { |
| loff_t seek_res = lseek64(fd, 0, SEEK_SET); |
| if (seek_res == 0) { |
| char sb_region[4096]; |
| ssize_t read_res = read(fd, sb_region, 4096); |
| if (read_res >= 512) { |
| if (!memcmp(&sb_region[32], "NXSB", 4)) { |
| LOG(INFO) << "APFS filesystem detected."; |
| *outResult = true; |
| } |
| else { |
| LOG(VERBOSE) << "Filesystem detection failed (not an APFS " |
| << "filesystem)."; |
| *outResult = false; |
| } |
| |
| retval = 0; |
| } |
| else if (read_res != -1) { |
| int err = errno ? errno : EIO; |
| LOG(ERROR) << "Error while reading 4096 bytes from device " |
| << "offset 0: " << strerror(errno) << " (" << errno |
| << ")"; |
| errno = err; |
| } |
| } |
| else if (seek_res != -1) { |
| int err = errno ? errno : EIO; |
| LOG(ERROR) << "Error while seeking to device offset 0: " |
| << strerror(errno) << " (" << errno << ")"; |
| errno = err; |
| } |
| |
| close(fd); |
| } |
| |
| return retval; |
| } |
| |
| } // namespace apfs |
| } // namespace vold |
| } // namespace android |