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/*
* Copyright (C) 2012 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 <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <string>
#include <vector>
#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>
#include <android-base/logging.h>
#include <android-base/properties.h>
#include <android-base/stringprintf.h>
#include <cutils/properties.h>
#include <fscrypt/fscrypt.h>
#include <logwrap/logwrap.h>
#include <selinux/selinux.h>
#include "Ext4.h"
#include "FsCrypt.h"
#include "Utils.h"
#include "VoldUtil.h"
using android::base::StringPrintf;
namespace android {
namespace vold {
namespace ext4 {
static const char* kResizefsPath = "/system/bin/resize2fs";
static const char* kMkfsPath = "/system/bin/mke2fs";
static const char* kFsckPath = "/system/bin/e2fsck";
bool IsSupported() {
return access(kMkfsPath, X_OK) == 0 && access(kFsckPath, X_OK) == 0 &&
IsFilesystemSupported("ext4");
}
status_t Check(const std::string& source, const std::string& target) {
// The following is shamelessly borrowed from fs_mgr.c, so it should be
// kept in sync with any changes over there.
const char* c_source = source.c_str();
const char* c_target = target.c_str();
int status;
int ret;
long tmpmnt_flags = MS_NOATIME | MS_NOEXEC | MS_NOSUID;
char* tmpmnt_opts = (char*)"nomblk_io_submit,errors=remount-ro";
/*
* First try to mount and unmount the filesystem. We do this because
* the kernel is more efficient than e2fsck in running the journal and
* processing orphaned inodes, and on at least one device with a
* performance issue in the emmc firmware, it can take e2fsck 2.5 minutes
* to do what the kernel does in about a second.
*
* After mounting and unmounting the filesystem, run e2fsck, and if an
* error is recorded in the filesystem superblock, e2fsck will do a full
* check. Otherwise, it does nothing. If the kernel cannot mount the
* filesytsem due to an error, e2fsck is still run to do a full check
* fix the filesystem.
*/
ret = mount(c_source, c_target, "ext4", tmpmnt_flags, tmpmnt_opts);
if (!ret) {
int i;
for (i = 0; i < 5; i++) {
// Try to umount 5 times before continuing on.
// Should we try rebooting if all attempts fail?
int result = umount(c_target);
if (result == 0) {
break;
}
LOG(WARNING) << __func__ << "(): umount(" << c_target << ")=" << result << ": "
<< strerror(errno);
sleep(1);
}
}
/*
* Some system images do not have e2fsck for licensing reasons
* (e.g. recent SDK system images). Detect these and skip the check.
*/
if (access(kFsckPath, X_OK)) {
LOG(DEBUG) << "Not running " << kFsckPath << " on " << c_source
<< " (executable not in system image)";
} else {
LOG(DEBUG) << "Running " << kFsckPath << " on " << c_source;
std::vector<std::string> cmd;
cmd.push_back(kFsckPath);
cmd.push_back("-y");
cmd.push_back(c_source);
// ext4 devices are currently always trusted
return ForkExecvp(cmd, nullptr, sFsckContext);
}
return 0;
}
status_t Mount(const std::string& source, const std::string& target, bool ro, bool remount,
bool executable) {
int rc;
unsigned long flags;
const char* c_source = source.c_str();
const char* c_target = target.c_str();
flags = MS_NOATIME | MS_NODEV | MS_NOSUID | MS_DIRSYNC;
flags |= (executable ? 0 : MS_NOEXEC);
flags |= (ro ? MS_RDONLY : 0);
flags |= (remount ? MS_REMOUNT : 0);
rc = mount(c_source, c_target, "ext4", flags, NULL);
if (rc && errno == EROFS) {
LOG(ERROR) << source << " appears to be a read only filesystem - retrying mount RO";
flags |= MS_RDONLY;
rc = mount(c_source, c_target, "ext4", flags, NULL);
}
return rc;
}
status_t Resize(const std::string& source, unsigned long numSectors) {
std::vector<std::string> cmd;
cmd.push_back(kResizefsPath);
cmd.push_back("-f");
cmd.push_back(source);
cmd.push_back(StringPrintf("%lu", numSectors));
return ForkExecvp(cmd);
}
status_t Format(const std::string& source, unsigned long numSectors, const std::string& target) {
std::vector<std::string> cmd;
cmd.push_back(kMkfsPath);
cmd.push_back("-b");
cmd.push_back("4096");
cmd.push_back("-t");
cmd.push_back("ext4");
cmd.push_back("-M");
cmd.push_back(target);
bool needs_casefold =
android::base::GetBoolProperty("external_storage.casefold.enabled", false);
bool needs_projid = android::base::GetBoolProperty("external_storage.projid.enabled", false);
if (needs_projid) {
cmd.push_back("-I");
cmd.push_back("512");
}
std::string options("has_journal");
if (android::base::GetBoolProperty("vold.has_quota", false)) {
options += ",quota";
}
if (fscrypt_is_native()) {
options += ",encrypt";
}
if (needs_casefold) {
options += ",casefold";
}
cmd.push_back("-O");
cmd.push_back(options);
if (needs_casefold || needs_projid) {
cmd.push_back("-E");
std::string extopts = "";
if (needs_casefold) extopts += "encoding=utf8,";
if (needs_projid) extopts += "quotatype=prjquota,";
cmd.push_back(extopts);
}
cmd.push_back(source);
if (numSectors) {
cmd.push_back(StringPrintf("%lu", numSectors * (4096 / 512)));
}
return ForkExecvp(cmd);
}
} // namespace ext4
} // namespace vold
} // namespace android