110 lines
3.1 KiB
C++
110 lines
3.1 KiB
C++
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/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "Checkpoint"
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#include "Checkpoint.h"
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#include <android-base/file.h>
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#include <android-base/parseint.h>
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#include <cutils/android_reboot.h>
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#include <fs_mgr.h>
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#include <mntent.h>
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#include <sys/mount.h>
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#include <list>
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#include <string>
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namespace android {
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namespace vold {
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static const std::string kMetadataCPFile = "/metadata/vold/checkpoint";
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bool cp_startCheckpoint(int retry) {
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if (retry < -1) return false;
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std::string content = std::to_string(retry);
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return android::base::WriteStringToFile(content, kMetadataCPFile);
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}
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bool cp_commitChanges() {
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struct fstab* fstab = fs_mgr_read_fstab_default();
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if (!fstab) return false;
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FILE* fp = setmntent("/proc/mounts", "r");
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mntent* mentry;
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if (fp == NULL) return false;
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while ((mentry = getmntent(fp)) != NULL) {
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auto test = std::string(mentry->mnt_dir) + "/";
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for (int i = 0; i < fstab->num_entries; i++) {
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if (!fs_mgr_is_checkpoint(&fstab->recs[i])) continue;
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if (!strcmp(fstab->recs[i].mount_point, mentry->mnt_dir) &&
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!strcmp(fstab->recs[i].fs_type, mentry->mnt_type)) {
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if (!strcmp(fstab->recs[i].fs_type, "f2fs")) {
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mount(mentry->mnt_fsname, mentry->mnt_dir, "none",
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MS_REMOUNT | fstab->recs[i].flags, "checkpoint=enable");
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}
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}
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}
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}
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endmntent(fp);
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fs_mgr_free_fstab(fstab);
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return android::base::RemoveFileIfExists(kMetadataCPFile);
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}
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void cp_abortChanges() {
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android_reboot(ANDROID_RB_RESTART2, 0, nullptr);
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}
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bool cp_needRollback(const std::string& id) {
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std::string content;
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bool ret;
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ret = android::base::ReadFileToString(kMetadataCPFile, &content);
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if (ret) return content == "0";
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return false;
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}
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bool cp_needsCheckpoint(void) {
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bool ret;
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std::string content;
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ret = android::base::ReadFileToString(kMetadataCPFile, &content);
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if (ret) return content != "0";
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return false;
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}
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bool cp_prepareDriveForCheckpoint(const std::string& mountPoint) {
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return false;
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}
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bool cp_markBootAttempt() {
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std::string oldContent, newContent;
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int retry = 0;
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if (!android::base::ReadFileToString(kMetadataCPFile, &oldContent)) return false;
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if (!android::base::ParseInt(oldContent, &retry)) return false;
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if (retry > 0) retry--;
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newContent = std::to_string(retry);
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return android::base::WriteStringToFile(newContent, kMetadataCPFile);
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}
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} // namespace vold
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} // namespace android
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