gecko-dev/dom/quota/QuotaObject.cpp

424 строки
11 KiB
C++
Исходник Обычный вид История

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "QuotaObject.h"
#include "QuotaManager.h"
#include "Utilities.h"
USING_QUOTA_NAMESPACE
void
QuotaObject::AddRef()
{
QuotaManager* quotaManager = QuotaManager::Get();
if (!quotaManager) {
NS_ERROR("Null quota manager, this shouldn't happen, possible leak!");
++mRefCnt;
return;
}
MutexAutoLock lock(quotaManager->mQuotaMutex);
++mRefCnt;
}
void
QuotaObject::Release()
{
QuotaManager* quotaManager = QuotaManager::Get();
if (!quotaManager) {
NS_ERROR("Null quota manager, this shouldn't happen, possible leak!");
nsrefcnt count = --mRefCnt;
if (count == 0) {
mRefCnt = 1;
delete this;
}
return;
}
{
MutexAutoLock lock(quotaManager->mQuotaMutex);
--mRefCnt;
if (mRefCnt > 0) {
return;
}
if (mOriginInfo) {
mOriginInfo->mQuotaObjects.Remove(mPath);
}
}
delete this;
}
void
QuotaObject::UpdateSize(int64_t aSize)
{
QuotaManager* quotaManager = QuotaManager::Get();
NS_ASSERTION(quotaManager, "Shouldn't be null!");
MutexAutoLock lock(quotaManager->mQuotaMutex);
if (!mOriginInfo) {
return;
}
GroupInfo* groupInfo = mOriginInfo->mGroupInfo;
if (groupInfo->IsForTemporaryStorage()) {
quotaManager->mTemporaryStorageUsage -= mSize;
}
groupInfo->mUsage -= mSize;
mOriginInfo->mUsage -= mSize;
mSize = aSize;
mOriginInfo->mUsage += mSize;
groupInfo->mUsage += mSize;
if (groupInfo->IsForTemporaryStorage()) {
quotaManager->mTemporaryStorageUsage += mSize;
}
}
bool
QuotaObject::MaybeAllocateMoreSpace(int64_t aOffset, int32_t aCount)
{
int64_t end = aOffset + aCount;
QuotaManager* quotaManager = QuotaManager::Get();
NS_ASSERTION(quotaManager, "Shouldn't be null!");
MutexAutoLock lock(quotaManager->mQuotaMutex);
if (mSize >= end || !mOriginInfo) {
return true;
}
GroupInfo* groupInfo = mOriginInfo->mGroupInfo;
if (groupInfo->IsForPersistentStorage()) {
uint64_t newUsage = mOriginInfo->mUsage - mSize + end;
if (newUsage > mOriginInfo->mLimit) {
// This will block the thread, but it will also drop the mutex while
// waiting. The mutex will be reacquired again when the waiting is
// finished.
if (!quotaManager->LockedQuotaIsLifted()) {
return false;
}
// Threads raced, the origin info removal has been done by some other
// thread.
if (!mOriginInfo) {
// The other thread could allocate more space.
if (end > mSize) {
mSize = end;
}
return true;
}
nsCString group = mOriginInfo->mGroupInfo->mGroup;
nsCString origin = mOriginInfo->mOrigin;
mOriginInfo->LockedClearOriginInfos();
NS_ASSERTION(!mOriginInfo,
"Should have cleared in LockedClearOriginInfos!");
quotaManager->LockedRemoveQuotaForOrigin(PERSISTENCE_TYPE_PERSISTENT,
group, origin);
// Some other thread could increase the size without blocking (increasing
// the origin usage without hitting the limit), but no more than this one.
NS_ASSERTION(mSize < end, "This shouldn't happen!");
mSize = end;
return true;
}
mOriginInfo->mUsage = newUsage;
groupInfo->mUsage = groupInfo->mUsage - mSize + end;
mSize = end;
return true;
}
NS_ASSERTION(groupInfo->mPersistenceType == PERSISTENCE_TYPE_TEMPORARY,
"Huh?");
uint64_t delta = end - mSize;
uint64_t newUsage = mOriginInfo->mUsage + delta;
// Temporary storage has no limit for origin usage (there's a group and the
// global limit though).
uint64_t newGroupUsage = groupInfo->mUsage + delta;
// Temporary storage has a hard limit for group usage (20 % of the global
// limit).
if (newGroupUsage > quotaManager->GetGroupLimit()) {
return false;
}
uint64_t newTemporaryStorageUsage = quotaManager->mTemporaryStorageUsage +
delta;
if (newTemporaryStorageUsage > quotaManager->mTemporaryStorageLimit) {
// This will block the thread without holding the lock while waitting.
nsAutoTArray<OriginInfo*, 10> originInfos;
uint64_t sizeToBeFreed =
quotaManager->LockedCollectOriginsForEviction(delta, originInfos);
if (!sizeToBeFreed) {
return false;
}
NS_ASSERTION(sizeToBeFreed >= delta, "Huh?");
{
MutexAutoUnlock autoUnlock(quotaManager->mQuotaMutex);
for (uint32_t i = 0; i < originInfos.Length(); i++) {
quotaManager->DeleteTemporaryFilesForOrigin(originInfos[i]->mOrigin);
}
}
// Relocked.
NS_ASSERTION(mOriginInfo, "How come?!");
nsTArray<nsCString> origins;
for (uint32_t i = 0; i < originInfos.Length(); i++) {
OriginInfo* originInfo = originInfos[i];
NS_ASSERTION(originInfo != mOriginInfo, "Deleted itself!");
nsCString group = originInfo->mGroupInfo->mGroup;
nsCString origin = originInfo->mOrigin;
quotaManager->LockedRemoveQuotaForOrigin(PERSISTENCE_TYPE_TEMPORARY,
group, origin);
#ifdef DEBUG
originInfos[i] = nullptr;
#endif
origins.AppendElement(origin);
}
// We unlocked and relocked several times so we need to recompute all the
// essential variables and recheck the group limit.
delta = end - mSize;
newUsage = mOriginInfo->mUsage + delta;
newGroupUsage = groupInfo->mUsage + delta;
if (newGroupUsage > quotaManager->GetGroupLimit()) {
// Unfortunately some other thread increased the group usage in the
// meantime and we are not below the group limit anymore.
// However, the origin eviction must be finalized in this case too.
MutexAutoUnlock autoUnlock(quotaManager->mQuotaMutex);
quotaManager->FinalizeOriginEviction(origins);
return false;
}
newTemporaryStorageUsage = quotaManager->mTemporaryStorageUsage + delta;
NS_ASSERTION(newTemporaryStorageUsage <=
quotaManager->mTemporaryStorageLimit, "How come?!");
// Ok, we successfully freed enough space and the operation can continue
// without throwing the quota error.
mOriginInfo->mUsage = newUsage;
groupInfo->mUsage = newGroupUsage;
quotaManager->mTemporaryStorageUsage = newTemporaryStorageUsage;;
// Some other thread could increase the size in the meantime, but no more
// than this one.
NS_ASSERTION(mSize < end, "This shouldn't happen!");
mSize = end;
// Finally, release IO thread only objects and allow next synchronized
// ops for the evicted origins.
MutexAutoUnlock autoUnlock(quotaManager->mQuotaMutex);
quotaManager->FinalizeOriginEviction(origins);
return true;
}
mOriginInfo->mUsage = newUsage;
groupInfo->mUsage = newGroupUsage;
quotaManager->mTemporaryStorageUsage = newTemporaryStorageUsage;
mSize = end;
return true;
}
void
OriginInfo::LockedDecreaseUsage(int64_t aSize)
{
AssertCurrentThreadOwnsQuotaMutex();
mUsage -= aSize;
mGroupInfo->mUsage -= aSize;
if (mGroupInfo->IsForTemporaryStorage()) {
QuotaManager* quotaManager = QuotaManager::Get();
NS_ASSERTION(quotaManager, "Shouldn't be null!");
quotaManager->mTemporaryStorageUsage -= aSize;
}
}
// static
PLDHashOperator
OriginInfo::ClearOriginInfoCallback(const nsAString& aKey,
QuotaObject* aValue,
void* aUserArg)
{
NS_ASSERTION(!aKey.IsEmpty(), "Empty key!");
NS_ASSERTION(aValue, "Null pointer!");
aValue->mOriginInfo = nullptr;
return PL_DHASH_NEXT;
}
already_AddRefed<OriginInfo>
GroupInfo::LockedGetOriginInfo(const nsACString& aOrigin)
{
AssertCurrentThreadOwnsQuotaMutex();
for (uint32_t index = 0; index < mOriginInfos.Length(); index++) {
nsRefPtr<OriginInfo>& originInfo = mOriginInfos[index];
if (originInfo->mOrigin == aOrigin) {
nsRefPtr<OriginInfo> result = originInfo;
return result.forget();
}
}
return nullptr;
}
void
GroupInfo::LockedAddOriginInfo(OriginInfo* aOriginInfo)
{
AssertCurrentThreadOwnsQuotaMutex();
NS_ASSERTION(!mOriginInfos.Contains(aOriginInfo),
"Replacing an existing entry!");
mOriginInfos.AppendElement(aOriginInfo);
mUsage += aOriginInfo->mUsage;
if (IsForTemporaryStorage()) {
QuotaManager* quotaManager = QuotaManager::Get();
NS_ASSERTION(quotaManager, "Shouldn't be null!");
quotaManager->mTemporaryStorageUsage += aOriginInfo->mUsage;
}
}
void
GroupInfo::LockedRemoveOriginInfo(const nsACString& aOrigin)
{
AssertCurrentThreadOwnsQuotaMutex();
for (uint32_t index = 0; index < mOriginInfos.Length(); index++) {
if (mOriginInfos[index]->mOrigin == aOrigin) {
mUsage -= mOriginInfos[index]->mUsage;
if (IsForTemporaryStorage()) {
QuotaManager* quotaManager = QuotaManager::Get();
NS_ASSERTION(quotaManager, "Shouldn't be null!");
quotaManager->mTemporaryStorageUsage -= mOriginInfos[index]->mUsage;
}
mOriginInfos.RemoveElementAt(index);
return;
}
}
}
void
GroupInfo::LockedRemoveOriginInfos()
{
AssertCurrentThreadOwnsQuotaMutex();
for (uint32_t index = mOriginInfos.Length(); index > 0; index--) {
mUsage -= mOriginInfos[index - 1]->mUsage;
if (IsForTemporaryStorage()) {
QuotaManager* quotaManager = QuotaManager::Get();
NS_ASSERTION(quotaManager, "Shouldn't be null!");
quotaManager->mTemporaryStorageUsage -= mOriginInfos[index - 1]->mUsage;
}
mOriginInfos.RemoveElementAt(index - 1);
}
}
void
GroupInfo::LockedRemoveOriginInfosForPattern(const nsACString& aPattern)
{
AssertCurrentThreadOwnsQuotaMutex();
for (uint32_t index = mOriginInfos.Length(); index > 0; index--) {
if (PatternMatchesOrigin(aPattern, mOriginInfos[index - 1]->mOrigin)) {
mUsage -= mOriginInfos[index - 1]->mUsage;
if (IsForTemporaryStorage()) {
QuotaManager* quotaManager = QuotaManager::Get();
NS_ASSERTION(quotaManager, "Shouldn't be null!");
quotaManager->mTemporaryStorageUsage -= mOriginInfos[index - 1]->mUsage;
}
mOriginInfos.RemoveElementAt(index - 1);
}
}
}
nsRefPtr<GroupInfo>&
GroupInfoPair::GetGroupInfoForPersistenceType(PersistenceType aPersistenceType)
{
switch (aPersistenceType) {
case PERSISTENCE_TYPE_PERSISTENT:
return mPersistentStorageGroupInfo;
case PERSISTENCE_TYPE_TEMPORARY:
return mTemporaryStorageGroupInfo;
case PERSISTENCE_TYPE_INVALID:
default:
MOZ_CRASH("Bad persistence type value!");
return mPersistentStorageGroupInfo;
}
}