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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 <health-storage-impl/common.h>
#include <android-base/chrono_utils.h>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/strings.h>
#include <fstab/fstab.h>
using ::android::base::ReadFileToString;
using ::android::base::Timer;
using ::android::base::Trim;
using ::android::base::WriteStringToFd;
using ::android::base::WriteStringToFile;
using ::android::fs_mgr::Fstab;
using ::android::fs_mgr::ReadDefaultFstab;
using ::android::hardware::health::storage::V1_0::Result;
namespace android::hardware::health::storage {
static std::string GetGarbageCollectPath() {
Fstab fstab;
ReadDefaultFstab(&fstab);
for (const auto& entry : fstab) {
if (!entry.sysfs_path.empty()) {
return entry.sysfs_path + "/manual_gc";
}
}
return "";
}
static std::string GetWriteBoosterPath() {
Fstab fstab;
ReadDefaultFstab(&fstab);
for (const auto& entry : fstab) {
if (!entry.sysfs_path.empty()) {
return entry.sysfs_path + "/attributes/wb_avail_buf";
}
}
return "";
}
Result GarbageCollect(uint64_t timeout_seconds) {
std::string gc_path = GetGarbageCollectPath();
if (gc_path.empty()) {
LOG(WARNING) << "Cannot find Dev GC path";
return Result::UNKNOWN_ERROR;
}
Result result = Result::SUCCESS;
Timer timer;
LOG(INFO) << "Start Dev GC on " << gc_path;
while (1) {
std::string require_gc;
if (!ReadFileToString(gc_path, &require_gc)) {
PLOG(WARNING) << "Reading manual_gc failed in " << gc_path;
result = Result::IO_ERROR;
break;
}
require_gc = Trim(require_gc);
std::string wb_path = GetWriteBoosterPath();
// Let's flush WB till 100% available
std::string wb_avail = "0x0000000A";
if (!wb_path.empty() && !ReadFileToString(wb_path, &wb_avail)) {
PLOG(WARNING) << "Reading wb_avail_buf failed in " << wb_path;
}
wb_avail = Trim(wb_avail);
if (require_gc == "disabled") {
LOG(DEBUG) << "Disabled Dev GC";
break;
}
if ((require_gc == "" || require_gc == "off") && wb_avail == "0x0000000A") {
LOG(DEBUG) << "No more to do Dev GC";
break;
}
LOG(DEBUG) << "Trigger Dev GC on " << gc_path << " having " << require_gc << ", WB on "
<< wb_path << " having " << wb_avail;
if (!WriteStringToFile("1", gc_path)) {
PLOG(WARNING) << "Start Dev GC failed on " << gc_path;
result = Result::IO_ERROR;
break;
}
if (timer.duration() >= std::chrono::seconds(timeout_seconds)) {
LOG(WARNING) << "Dev GC timeout";
// Timeout is not treated as an error. Try next time.
break;
}
sleep(2);
}
LOG(INFO) << "Stop Dev GC on " << gc_path;
if (!WriteStringToFile("0", gc_path)) {
PLOG(WARNING) << "Stop Dev GC failed on " << gc_path;
result = Result::IO_ERROR;
}
return result;
}
void DebugDump(int fd) {
std::stringstream output;
std::string path = GetGarbageCollectPath();
if (path.empty()) {
output << "Cannot find Dev GC path";
} else {
std::string require_gc;
if (ReadFileToString(path, &require_gc)) {
output << path << ":" << require_gc << std::endl;
}
if (WriteStringToFile("0", path)) {
output << "stop success" << std::endl;
}
}
std::string wb_path = GetWriteBoosterPath();
if (wb_path.empty()) {
output << "Cannot find Dev WriteBooster path";
} else {
std::string wb_available;
if (ReadFileToString(wb_path, &wb_available)) {
output << wb_path << ":" << wb_available << std::endl;
}
}
if (!WriteStringToFd(output.str(), fd)) {
PLOG(WARNING) << "debug: cannot write to fd";
}
fsync(fd);
}
} // namespace android::hardware::health::storage
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