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/*
* Copyright (C) 2015 The Android Open Source Project
*
* 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 <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <errno.h>
#include <cutils/partition_utils.h>
#include <sys/mount.h>
#include <android-base/unique_fd.h>
#include <ext4_utils/ext4.h>
#include <ext4_utils/ext4_utils.h>
#include <logwrap/logwrap.h>
#include <selinux/android.h>
#include <selinux/label.h>
#include <selinux/selinux.h>
#include "fs_mgr_priv.h"
#include "cryptfs.h"
using android::base::unique_fd;
// Realistically, this file should be part of the android::fs_mgr namespace;
using namespace android::fs_mgr;
static int get_dev_sz(const std::string& fs_blkdev, uint64_t* dev_sz) {
unique_fd fd(TEMP_FAILURE_RETRY(open(fs_blkdev.c_str(), O_RDONLY | O_CLOEXEC)));
if (fd < 0) {
PERROR << "Cannot open block device";
return -1;
}
if ((ioctl(fd, BLKGETSIZE64, dev_sz)) == -1) {
PERROR << "Cannot get block device size";
return -1;
}
return 0;
}
static int format_ext4(const std::string& fs_blkdev, const std::string& fs_mnt_point,
bool crypt_footer) {
uint64_t dev_sz;
int rc = 0;
rc = get_dev_sz(fs_blkdev, &dev_sz);
if (rc) {
return rc;
}
/* Format the partition using the calculated length */
if (crypt_footer) {
dev_sz -= CRYPT_FOOTER_OFFSET;
}
std::string size_str = std::to_string(dev_sz / 4096);
const char* const mke2fs_args[] = {
"/system/bin/mke2fs", "-t", "ext4", "-b", "4096", fs_blkdev.c_str(),
size_str.c_str(), nullptr};
rc = android_fork_execvp_ext(arraysize(mke2fs_args), const_cast<char**>(mke2fs_args), NULL,
true, LOG_KLOG, true, nullptr, nullptr, 0);
if (rc) {
LERROR << "mke2fs returned " << rc;
return rc;
}
const char* const e2fsdroid_args[] = {
"/system/bin/e2fsdroid", "-e", "-a", fs_mnt_point.c_str(), fs_blkdev.c_str(), nullptr};
rc = android_fork_execvp_ext(arraysize(e2fsdroid_args), const_cast<char**>(e2fsdroid_args),
NULL, true, LOG_KLOG, true, nullptr, nullptr, 0);
if (rc) {
LERROR << "e2fsdroid returned " << rc;
}
return rc;
}
static int format_f2fs(const std::string& fs_blkdev, uint64_t dev_sz, bool crypt_footer) {
if (!dev_sz) {
int rc = get_dev_sz(fs_blkdev, &dev_sz);
if (rc) {
return rc;
}
}
/* Format the partition using the calculated length */
if (crypt_footer) {
dev_sz -= CRYPT_FOOTER_OFFSET;
}
std::string size_str = std::to_string(dev_sz / 4096);
// clang-format off
const char* const args[] = {
"/system/bin/make_f2fs",
"-g", "android",
fs_blkdev.c_str(),
size_str.c_str(),
nullptr
};
// clang-format on
return android_fork_execvp_ext(arraysize(args), const_cast<char**>(args), NULL, true,
LOG_KLOG, true, nullptr, nullptr, 0);
}
int fs_mgr_do_format(const FstabEntry& entry, bool crypt_footer) {
LERROR << __FUNCTION__ << ": Format " << entry.blk_device << " as '" << entry.fs_type << "'";
if (entry.fs_type == "f2fs") {
return format_f2fs(entry.blk_device, entry.length, crypt_footer);
} else if (entry.fs_type == "ext4") {
return format_ext4(entry.blk_device, entry.mount_point, crypt_footer);
} else {
LERROR << "File system type '" << entry.fs_type << "' is not supported";
return -EINVAL;
}
}
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