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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/properties.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, bool needs_projid, bool needs_metadata_csum) {
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);
std::vector<const char*> mke2fs_args = {"/system/bin/mke2fs", "-t", "ext4", "-b", "4096"};
// Project ID's require wider inodes. The Quotas themselves are enabled by tune2fs during boot.
if (needs_projid) {
mke2fs_args.push_back("-I");
mke2fs_args.push_back("512");
}
// casefolding is enabled via tune2fs during boot.
if (needs_metadata_csum) {
mke2fs_args.push_back("-O");
mke2fs_args.push_back("metadata_csum");
// tune2fs recommends to enable 64bit and extent:
// Extents are not enabled. The file extent tree can be checksummed,
// whereas block maps cannot. Not enabling extents reduces the coverage
// of metadata checksumming. Re-run with -O extent to rectify.
// 64-bit filesystem support is not enabled. The larger fields afforded
// by this feature enable full-strength checksumming. Run resize2fs -b to rectify.
mke2fs_args.push_back("-O");
mke2fs_args.push_back("64bit");
mke2fs_args.push_back("-O");
mke2fs_args.push_back("extent");
}
mke2fs_args.push_back(fs_blkdev.c_str());
mke2fs_args.push_back(size_str.c_str());
rc = logwrap_fork_execvp(mke2fs_args.size(), mke2fs_args.data(), nullptr, false, LOG_KLOG,
false, nullptr);
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 = logwrap_fork_execvp(arraysize(e2fsdroid_args), e2fsdroid_args, nullptr, false, LOG_KLOG,
false, nullptr);
if (rc) {
LERROR << "e2fsdroid returned " << rc;
}
return rc;
}
static int format_f2fs(const std::string& fs_blkdev, uint64_t dev_sz, bool crypt_footer,
bool needs_projid, bool needs_casefold, bool fs_compress) {
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);
std::vector<const char*> args = {"/system/bin/make_f2fs", "-g", "android"};
if (needs_projid) {
args.push_back("-O");
args.push_back("project_quota,extra_attr");
}
if (needs_casefold) {
args.push_back("-O");
args.push_back("casefold");
args.push_back("-C");
args.push_back("utf8");
}
if (fs_compress) {
args.push_back("-O");
args.push_back("compression");
args.push_back("-O");
args.push_back("extra_attr");
}
args.push_back(fs_blkdev.c_str());
args.push_back(size_str.c_str());
return logwrap_fork_execvp(args.size(), args.data(), nullptr, false, LOG_KLOG, false, nullptr);
}
int fs_mgr_do_format(const FstabEntry& entry, bool crypt_footer) {
LERROR << __FUNCTION__ << ": Format " << entry.blk_device << " as '" << entry.fs_type << "'";
bool needs_casefold = false;
bool needs_projid = false;
if (entry.mount_point == "/data") {
needs_casefold = android::base::GetBoolProperty("external_storage.casefold.enabled", false);
needs_projid = android::base::GetBoolProperty("external_storage.projid.enabled", false);
}
if (entry.fs_type == "f2fs") {
return format_f2fs(entry.blk_device, entry.length, crypt_footer, needs_projid,
needs_casefold, entry.fs_mgr_flags.fs_compress);
} else if (entry.fs_type == "ext4") {
return format_ext4(entry.blk_device, entry.mount_point, crypt_footer, needs_projid,
entry.fs_mgr_flags.ext_meta_csum);
} else if (entry.fs_type == "vfat") {
std::vector<const char*> args = {"/system/bin/newfs_msdos",
entry.blk_device.c_str()};
return logwrap_fork_execvp(args.size(), args.data(), nullptr, false, LOG_KLOG, false, nullptr);
} else {
LERROR << "File system type '" << entry.fs_type << "' is not supported";
return -EINVAL;
}
}
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