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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "storage/browser/quota/quota_settings.h"
#include <algorithm>
#include <limits>
#include <memory>
#include <utility>
#include "base/bind.h"
#include "base/rand_util.h"
#include "base/system/sys_info.h"
#include "base/task/post_task.h"
#include "base/task/thread_pool.h"
#include "base/threading/scoped_blocking_call.h"
#include "build/build_config.h"
#include "storage/browser/quota/quota_device_info_helper.h"
#include "storage/browser/quota/quota_features.h"
#include "storage/browser/quota/quota_macros.h"
namespace storage {
namespace {
const int64_t _kMBytes = 1024 * 1024;
const int kRandomizedPercentage = 10;
const double kDefaultPerHostRatio = 0.75;
const double kIncognitoQuotaRatioLowerBound = 0.15;
const double kIncognitoQuotaRatioUpperBound = 0.2;
// Skews |value| by +/- |percent|.
int64_t MyRandomizeByPercent(int64_t value, int percent) {
double random_percent = (base::RandDouble() - 0.5) * percent * 2;
return value + (value * (random_percent / 100.0));
}
QuotaSettings CalculateIncognitoDynamicSettings(
int64_t physical_memory_amount) {
// The incognito pool size is a fraction of the amount of system memory.
double incognito_pool_size_ratio =
kIncognitoQuotaRatioLowerBound +
(base::RandDouble() *
(kIncognitoQuotaRatioUpperBound - kIncognitoQuotaRatioLowerBound));
QuotaSettings settings;
settings.pool_size =
static_cast<int64_t>(physical_memory_amount * incognito_pool_size_ratio);
settings.per_host_quota = settings.pool_size / 3;
settings.session_only_per_host_quota = settings.per_host_quota;
settings.refresh_interval = base::TimeDelta::Max();
return settings;
}
absl::optional<QuotaSettings> CalculateNominalDynamicSettings(
const base::FilePath& partition_path,
bool is_incognito,
QuotaDeviceInfoHelper* device_info_helper) {
base::ScopedBlockingCall scoped_blocking_call(FROM_HERE,
base::BlockingType::MAY_BLOCK);
if (is_incognito) {
return CalculateIncognitoDynamicSettings(
device_info_helper->AmountOfPhysicalMemory());
}
// The fraction of the device's storage the browser is willing to use for
// temporary storage.
const double kTemporaryPoolSizeRatio = features::kPoolSizeRatio.Get();
// The fixed size in bytes the browser is willing to use for temporary
// storage. If both the ratio and the absolute size are set, the lower value
// will be honored.
const int64_t kTemporaryPoolSizeFixed =
static_cast<int64_t>(features::kPoolSizeBytes.Get());
// The amount of the device's storage the browser attempts to
// keep free. If there is less than this amount of storage free
// on the device, Chrome will grant 0 quota to origins.
//
// Prior to M66, this was 10% of total storage instead of a fixed value on
// all devices. Now the minimum of a fixed value (2GB) and 10% is used to
// limit the reserve on devices with plenty of storage, but scale down for
// devices with extremely limited storage.
// * 1TB storage -- min(100GB,2GB) = 2GB
// * 500GB storage -- min(50GB,2GB) = 2GB
// * 64GB storage -- min(6GB,2GB) = 2GB
// * 16GB storage -- min(1.6GB,2GB) = 1.6GB
// * 8GB storage -- min(800MB,2GB) = 800MB
const int64_t kShouldRemainAvailableFixed =
static_cast<int64_t>(features::kShouldRemainAvailableBytes.Get());
const double kShouldRemainAvailableRatio =
features::kShouldRemainAvailableRatio.Get();
// The amount of the device's storage the browser attempts to
// keep free at all costs. Data will be aggressively evicted.
//
// Prior to M66, this was 1% of total storage instead of a fixed value on
// all devices. Now the minimum of a fixed value (1GB) and 1% is used to
// limit the reserve on devices with plenty of storage, but scale down for
// devices with extremely limited storage.
// * 1TB storage -- min(10GB,1GB) = 1GB
// * 500GB storage -- min(5GB,1GB) = 1GB
// * 64GB storage -- min(640MB,1GB) = 640MB
// * 16GB storage -- min(160MB,1GB) = 160MB
// * 8GB storage -- min(80MB,1GB) = 80MB
const int64_t kMustRemainAvailableFixed =
static_cast<int64_t>(features::kMustRemainAvailableBytes.Get());
const double kMustRemainAvailableRatio =
features::kMustRemainAvailableRatio.Get();
// The fraction of the temporary pool that can be utilized by a single host.
const double kPerHostTemporaryRatio = kDefaultPerHostRatio;
// SessionOnly (or ephemeral) origins are allotted a fraction of what
// normal origins are provided, and the amount is capped to a hard limit.
const double kSessionOnlyHostQuotaRatio = 0.1; // 10%
const int64_t kMaxSessionOnlyHostQuota = 300 * _kMBytes;
QuotaSettings settings;
int64_t total = device_info_helper->AmountOfTotalDiskSpace(partition_path);
if (total == -1) {
LOG(ERROR) << "Unable to compute QuotaSettings.";
return absl::nullopt;
}
// Pool size calculated by ratio.
int64_t pool_size_by_ratio = total * kTemporaryPoolSizeRatio;
int64_t pool_size =
kTemporaryPoolSizeFixed > 0
? std::min(kTemporaryPoolSizeFixed, pool_size_by_ratio)
: pool_size_by_ratio;
settings.pool_size = pool_size;
settings.should_remain_available =
std::min(kShouldRemainAvailableFixed,
static_cast<int64_t>(total * kShouldRemainAvailableRatio));
settings.must_remain_available =
std::min(kMustRemainAvailableFixed,
static_cast<int64_t>(total * kMustRemainAvailableRatio));
settings.per_host_quota = pool_size * kPerHostTemporaryRatio;
settings.session_only_per_host_quota = std::min(
MyRandomizeByPercent(kMaxSessionOnlyHostQuota, kRandomizedPercentage),
static_cast<int64_t>(settings.per_host_quota *
kSessionOnlyHostQuotaRatio));
settings.refresh_interval = base::TimeDelta::FromSeconds(60);
return settings;
}
} // namespace
void GetNominalDynamicSettings(const base::FilePath& partition_path,
bool is_incognito,
QuotaDeviceInfoHelper* device_info_helper,
OptionalQuotaSettingsCallback callback) {
base::ThreadPool::PostTaskAndReplyWithResult(
FROM_HERE,
{base::MayBlock(), base::TaskPriority::USER_VISIBLE,
base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
base::BindOnce(&CalculateNominalDynamicSettings, partition_path,
is_incognito, base::Unretained(device_info_helper)),
std::move(callback));
}
QuotaDeviceInfoHelper* GetDefaultDeviceInfoHelper() {
static base::NoDestructor<QuotaDeviceInfoHelper> singleton;
return singleton.get();
}
double GetIncognitoQuotaRatioLowerBound_ForTesting() {
return kIncognitoQuotaRatioLowerBound;
}
double GetIncognitoQuotaRatioUpperBound_ForTesting() {
return kIncognitoQuotaRatioUpperBound;
}
} // namespace storage
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