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/*
* Copyright (C) 2021 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 "checkpoint_handling.h"
#include "log.h"
#include <fstab/fstab.h>
#include <cstring>
#include <string>
namespace {
bool checkpointingDoneForever = false;
} // namespace
int is_data_checkpoint_active(bool* active) {
if (!active) {
ALOGE("active out parameter is null");
return 0;
}
*active = false;
if (checkpointingDoneForever) {
return 0;
}
android::fs_mgr::Fstab procMounts;
bool success = android::fs_mgr::ReadFstabFromFile("/proc/mounts", &procMounts);
if (!success) {
ALOGE("Could not parse /proc/mounts\n");
/* Really bad. Tell the caller to abort the write. */
return -1;
}
android::fs_mgr::FstabEntry* dataEntry =
android::fs_mgr::GetEntryForMountPoint(&procMounts, "/data");
if (dataEntry == NULL) {
ALOGE("/data is not mounted yet\n");
return 0;
}
/* We can't handle e.g., ext4. Nothing we can do about it for now. */
if (dataEntry->fs_type != "f2fs") {
ALOGW("Checkpoint status not supported for filesystem %s\n", dataEntry->fs_type.c_str());
checkpointingDoneForever = true;
return 0;
}
/*
* The data entry looks like "... blah,checkpoint=disable:0,blah ...".
* checkpoint=disable means checkpointing is on (yes, arguably reversed).
*/
size_t checkpointPos = dataEntry->fs_options.find("checkpoint=disable");
if (checkpointPos == std::string::npos) {
/* Assumption is that once checkpointing turns off, it stays off */
checkpointingDoneForever = true;
} else {
*active = true;
}
return 0;
}
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