Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1952 insertions, 0 deletions

diff --git a/netwerk/cache2/CacheEntry.cpp b/netwerk/cache2/CacheEntry.cpp
new file mode 100644
index 0000000000..142d32d274
--- /dev/null
+++ b/netwerk/cache2/CacheEntry.cpp
@@ -0,0 +1,1952 @@
+/* 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 <algorithm>
+#include <math.h>
+
+#include "CacheEntry.h"
+
+#include "CacheFileUtils.h"
+#include "CacheIndex.h"
+#include "CacheLog.h"
+#include "CacheObserver.h"
+#include "CacheStorageService.h"
+#include "mozilla/IntegerPrintfMacros.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/psm/TransportSecurityInfo.h"
+#include "nsComponentManagerUtils.h"
+#include "nsIAsyncOutputStream.h"
+#include "nsICacheEntryOpenCallback.h"
+#include "nsICacheStorage.h"
+#include "nsIInputStream.h"
+#include "nsIOutputStream.h"
+#include "nsISeekableStream.h"
+#include "nsISizeOf.h"
+#include "nsIURI.h"
+#include "nsNetCID.h"
+#include "nsProxyRelease.h"
+#include "nsServiceManagerUtils.h"
+#include "nsString.h"
+#include "nsThreadUtils.h"
+
+namespace mozilla::net {
+
+static uint32_t const ENTRY_WANTED = nsICacheEntryOpenCallback::ENTRY_WANTED;
+static uint32_t const RECHECK_AFTER_WRITE_FINISHED =
+    nsICacheEntryOpenCallback::RECHECK_AFTER_WRITE_FINISHED;
+static uint32_t const ENTRY_NEEDS_REVALIDATION =
+    nsICacheEntryOpenCallback::ENTRY_NEEDS_REVALIDATION;
+static uint32_t const ENTRY_NOT_WANTED =
+    nsICacheEntryOpenCallback::ENTRY_NOT_WANTED;
+
+NS_IMPL_ISUPPORTS(CacheEntryHandle, nsICacheEntry)
+
+// CacheEntryHandle
+
+CacheEntryHandle::CacheEntryHandle(CacheEntry* aEntry) : mEntry(aEntry) {
+#ifdef DEBUG
+  if (!mEntry->HandlesCount()) {
+    // CacheEntry.mHandlesCount must go from zero to one only under
+    // the service lock. Can access CacheStorageService::Self() w/o a check
+    // since CacheEntry hrefs it.
+    CacheStorageService::Self()->Lock().AssertCurrentThreadOwns();
+  }
+#endif
+
+  mEntry->AddHandleRef();
+
+  LOG(("New CacheEntryHandle %p for entry %p", this, aEntry));
+}
+
+NS_IMETHODIMP CacheEntryHandle::Dismiss() {
+  LOG(("CacheEntryHandle::Dismiss %p", this));
+
+  if (mClosed.compareExchange(false, true)) {
+    mEntry->OnHandleClosed(this);
+    return NS_OK;
+  }
+
+  LOG(("  already dropped"));
+  return NS_ERROR_UNEXPECTED;
+}
+
+CacheEntryHandle::~CacheEntryHandle() {
+  mEntry->ReleaseHandleRef();
+  Dismiss();
+
+  LOG(("CacheEntryHandle::~CacheEntryHandle %p", this));
+}
+
+// CacheEntry::Callback
+
+CacheEntry::Callback::Callback(CacheEntry* aEntry,
+                               nsICacheEntryOpenCallback* aCallback,
+                               bool aReadOnly, bool aCheckOnAnyThread,
+                               bool aSecret)
+    : mEntry(aEntry),
+      mCallback(aCallback),
+      mTarget(GetCurrentSerialEventTarget()),
+      mReadOnly(aReadOnly),
+      mRevalidating(false),
+      mCheckOnAnyThread(aCheckOnAnyThread),
+      mRecheckAfterWrite(false),
+      mNotWanted(false),
+      mSecret(aSecret),
+      mDoomWhenFoundPinned(false),
+      mDoomWhenFoundNonPinned(false) {
+  MOZ_COUNT_CTOR(CacheEntry::Callback);
+
+  // The counter may go from zero to non-null only under the service lock
+  // but here we expect it to be already positive.
+  MOZ_ASSERT(mEntry->HandlesCount());
+  mEntry->AddHandleRef();
+}
+
+CacheEntry::Callback::Callback(CacheEntry* aEntry,
+                               bool aDoomWhenFoundInPinStatus)
+    : mEntry(aEntry),
+      mReadOnly(false),
+      mRevalidating(false),
+      mCheckOnAnyThread(true),
+      mRecheckAfterWrite(false),
+      mNotWanted(false),
+      mSecret(false),
+      mDoomWhenFoundPinned(aDoomWhenFoundInPinStatus),
+      mDoomWhenFoundNonPinned(!aDoomWhenFoundInPinStatus) {
+  MOZ_COUNT_CTOR(CacheEntry::Callback);
+  MOZ_ASSERT(mEntry->HandlesCount());
+  mEntry->AddHandleRef();
+}
+
+CacheEntry::Callback::Callback(CacheEntry::Callback const& aThat)
+    : mEntry(aThat.mEntry),
+      mCallback(aThat.mCallback),
+      mTarget(aThat.mTarget),
+      mReadOnly(aThat.mReadOnly),
+      mRevalidating(aThat.mRevalidating),
+      mCheckOnAnyThread(aThat.mCheckOnAnyThread),
+      mRecheckAfterWrite(aThat.mRecheckAfterWrite),
+      mNotWanted(aThat.mNotWanted),
+      mSecret(aThat.mSecret),
+      mDoomWhenFoundPinned(aThat.mDoomWhenFoundPinned),
+      mDoomWhenFoundNonPinned(aThat.mDoomWhenFoundNonPinned) {
+  MOZ_COUNT_CTOR(CacheEntry::Callback);
+
+  // The counter may go from zero to non-null only under the service lock
+  // but here we expect it to be already positive.
+  MOZ_ASSERT(mEntry->HandlesCount());
+  mEntry->AddHandleRef();
+}
+
+CacheEntry::Callback::~Callback() {
+  ProxyRelease("CacheEntry::Callback::mCallback", mCallback, mTarget);
+
+  mEntry->ReleaseHandleRef();
+  MOZ_COUNT_DTOR(CacheEntry::Callback);
+}
+
+// We have locks on both this and aEntry
+void CacheEntry::Callback::ExchangeEntry(CacheEntry* aEntry) {
+  aEntry->mLock.AssertCurrentThreadOwns();
+  mEntry->mLock.AssertCurrentThreadOwns();
+  if (mEntry == aEntry) return;
+
+  // The counter may go from zero to non-null only under the service lock
+  // but here we expect it to be already positive.
+  MOZ_ASSERT(aEntry->HandlesCount());
+  aEntry->AddHandleRef();
+  mEntry->ReleaseHandleRef();
+  mEntry = aEntry;
+}
+
+// This is called on entries in another entry's mCallback array, under the lock
+// of that other entry.  No other threads can access this entry at this time.
+bool CacheEntry::Callback::DeferDoom(bool* aDoom) const
+    MOZ_NO_THREAD_SAFETY_ANALYSIS {
+  MOZ_ASSERT(mEntry->mPinningKnown);
+
+  if (MOZ_UNLIKELY(mDoomWhenFoundNonPinned) ||
+      MOZ_UNLIKELY(mDoomWhenFoundPinned)) {
+    *aDoom =
+        (MOZ_UNLIKELY(mDoomWhenFoundNonPinned) &&
+         MOZ_LIKELY(!mEntry->mPinned)) ||
+        (MOZ_UNLIKELY(mDoomWhenFoundPinned) && MOZ_UNLIKELY(mEntry->mPinned));
+
+    return true;
+  }
+
+  return false;
+}
+
+nsresult CacheEntry::Callback::OnCheckThread(bool* aOnCheckThread) const {
+  if (!mCheckOnAnyThread) {
+    // Check we are on the target
+    return mTarget->IsOnCurrentThread(aOnCheckThread);
+  }
+
+  // We can invoke check anywhere
+  *aOnCheckThread = true;
+  return NS_OK;
+}
+
+nsresult CacheEntry::Callback::OnAvailThread(bool* aOnAvailThread) const {
+  return mTarget->IsOnCurrentThread(aOnAvailThread);
+}
+
+// CacheEntry
+
+NS_IMPL_ISUPPORTS(CacheEntry, nsIRunnable, CacheFileListener)
+
+/* static */
+uint64_t CacheEntry::GetNextId() {
+  static Atomic<uint64_t, Relaxed> id(0);
+  return ++id;
+}
+
+CacheEntry::CacheEntry(const nsACString& aStorageID, const nsACString& aURI,
+                       const nsACString& aEnhanceID, bool aUseDisk,
+                       bool aSkipSizeCheck, bool aPin)
+    : mURI(aURI),
+      mEnhanceID(aEnhanceID),
+      mStorageID(aStorageID),
+      mUseDisk(aUseDisk),
+      mSkipSizeCheck(aSkipSizeCheck),
+      mPinned(aPin),
+      mSecurityInfoLoaded(false),
+      mPreventCallbacks(false),
+      mHasData(false),
+      mPinningKnown(false),
+      mCacheEntryId(GetNextId()) {
+  LOG(("CacheEntry::CacheEntry [this=%p]", this));
+
+  mService = CacheStorageService::Self();
+
+  CacheStorageService::Self()->RecordMemoryOnlyEntry(this, !aUseDisk,
+                                                     true /* overwrite */);
+}
+
+CacheEntry::~CacheEntry() { LOG(("CacheEntry::~CacheEntry [this=%p]", this)); }
+
+char const* CacheEntry::StateString(uint32_t aState) {
+  switch (aState) {
+    case NOTLOADED:
+      return "NOTLOADED";
+    case LOADING:
+      return "LOADING";
+    case EMPTY:
+      return "EMPTY";
+    case WRITING:
+      return "WRITING";
+    case READY:
+      return "READY";
+    case REVALIDATING:
+      return "REVALIDATING";
+  }
+
+  return "?";
+}
+
+nsresult CacheEntry::HashingKeyWithStorage(nsACString& aResult) const {
+  return HashingKey(mStorageID, mEnhanceID, mURI, aResult);
+}
+
+nsresult CacheEntry::HashingKey(nsACString& aResult) const {
+  return HashingKey(""_ns, mEnhanceID, mURI, aResult);
+}
+
+// static
+nsresult CacheEntry::HashingKey(const nsACString& aStorageID,
+                                const nsACString& aEnhanceID, nsIURI* aURI,
+                                nsACString& aResult) {
+  nsAutoCString spec;
+  nsresult rv = aURI->GetAsciiSpec(spec);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return HashingKey(aStorageID, aEnhanceID, spec, aResult);
+}
+
+// static
+nsresult CacheEntry::HashingKey(const nsACString& aStorageID,
+                                const nsACString& aEnhanceID,
+                                const nsACString& aURISpec,
+                                nsACString& aResult) {
+  /**
+   * This key is used to salt hash that is a base for disk file name.
+   * Changing it will cause we will not be able to find files on disk.
+   */
+
+  aResult.Assign(aStorageID);
+
+  if (!aEnhanceID.IsEmpty()) {
+    CacheFileUtils::AppendTagWithValue(aResult, '~', aEnhanceID);
+  }
+
+  // Appending directly
+  aResult.Append(':');
+  aResult.Append(aURISpec);
+
+  return NS_OK;
+}
+
+void CacheEntry::AsyncOpen(nsICacheEntryOpenCallback* aCallback,
+                           uint32_t aFlags) {
+  bool readonly = aFlags & nsICacheStorage::OPEN_READONLY;
+  bool bypassIfBusy = aFlags & nsICacheStorage::OPEN_BYPASS_IF_BUSY;
+  bool truncate = aFlags & nsICacheStorage::OPEN_TRUNCATE;
+  bool priority = aFlags & nsICacheStorage::OPEN_PRIORITY;
+  bool multithread = aFlags & nsICacheStorage::CHECK_MULTITHREADED;
+  bool secret = aFlags & nsICacheStorage::OPEN_SECRETLY;
+
+  if (MOZ_LOG_TEST(gCache2Log, LogLevel::Debug)) {
+    MutexAutoLock lock(mLock);
+    LOG(("CacheEntry::AsyncOpen [this=%p, state=%s, flags=%d, callback=%p]",
+         this, StateString(mState), aFlags, aCallback));
+  }
+#ifdef DEBUG
+  {
+    // yes, if logging is on in DEBUG we'll take the lock twice in a row
+    MutexAutoLock lock(mLock);
+    MOZ_ASSERT(!readonly || !truncate, "Bad flags combination");
+    MOZ_ASSERT(!(truncate && mState > LOADING),
+               "Must not call truncate on already loaded entry");
+  }
+#endif
+
+  Callback callback(this, aCallback, readonly, multithread, secret);
+
+  if (!Open(callback, truncate, priority, bypassIfBusy)) {
+    // We get here when the callback wants to bypass cache when it's busy.
+    LOG(("  writing or revalidating, callback wants to bypass cache"));
+    callback.mNotWanted = true;
+    InvokeAvailableCallback(callback);
+  }
+}
+
+bool CacheEntry::Open(Callback& aCallback, bool aTruncate, bool aPriority,
+                      bool aBypassIfBusy) {
+  mozilla::MutexAutoLock lock(mLock);
+
+  // Check state under the lock
+  if (aBypassIfBusy && (mState == WRITING || mState == REVALIDATING)) {
+    return false;
+  }
+
+  RememberCallback(aCallback);
+
+  // Load() opens the lock
+  if (Load(aTruncate, aPriority)) {
+    // Loading is in progress...
+    return true;
+  }
+
+  InvokeCallbacks();
+
+  return true;
+}
+
+bool CacheEntry::Load(bool aTruncate, bool aPriority) {
+  LOG(("CacheEntry::Load [this=%p, trunc=%d]", this, aTruncate));
+
+  mLock.AssertCurrentThreadOwns();
+
+  if (mState > LOADING) {
+    LOG(("  already loaded"));
+    return false;
+  }
+
+  if (mState == LOADING) {
+    LOG(("  already loading"));
+    return true;
+  }
+
+  mState = LOADING;
+
+  MOZ_ASSERT(!mFile);
+
+  nsresult rv;
+
+  nsAutoCString fileKey;
+  rv = HashingKeyWithStorage(fileKey);
+
+  bool reportMiss = false;
+
+  // Check the index under two conditions for two states and take appropriate
+  // action:
+  // 1. When this is a disk entry and not told to truncate, check there is a
+  //    disk file.
+  //    If not, set the 'truncate' flag to true so that this entry will open
+  //    instantly as a new one.
+  // 2. When this is a memory-only entry, check there is a disk file.
+  //    If there is or could be, doom that file.
+  if ((!aTruncate || !mUseDisk) && NS_SUCCEEDED(rv)) {
+    // Check the index right now to know we have or have not the entry
+    // as soon as possible.
+    CacheIndex::EntryStatus status;
+    if (NS_SUCCEEDED(CacheIndex::HasEntry(fileKey, &status))) {
+      switch (status) {
+        case CacheIndex::DOES_NOT_EXIST:
+          // Doesn't apply to memory-only entries, Load() is called only once
+          // for them and never again for their session lifetime.
+          if (!aTruncate && mUseDisk) {
+            LOG(
+                ("  entry doesn't exist according information from the index, "
+                 "truncating"));
+            reportMiss = true;
+            aTruncate = true;
+          }
+          break;
+        case CacheIndex::EXISTS:
+        case CacheIndex::DO_NOT_KNOW:
+          if (!mUseDisk) {
+            LOG(
+                ("  entry open as memory-only, but there is a file, status=%d, "
+                 "dooming it",
+                 status));
+            CacheFileIOManager::DoomFileByKey(fileKey, nullptr);
+          }
+          break;
+      }
+    }
+  }
+
+  mFile = new CacheFile();
+
+  BackgroundOp(Ops::REGISTER);
+
+  bool directLoad = aTruncate || !mUseDisk;
+  if (directLoad) {
+    // mLoadStart will be used to calculate telemetry of life-time of this
+    // entry. Low resulution is then enough.
+    mLoadStart = TimeStamp::NowLoRes();
+    mPinningKnown = true;
+  } else {
+    mLoadStart = TimeStamp::Now();
+  }
+
+  {
+    mozilla::MutexAutoUnlock unlock(mLock);
+
+    if (reportMiss) {
+      CacheFileUtils::DetailedCacheHitTelemetry::AddRecord(
+          CacheFileUtils::DetailedCacheHitTelemetry::MISS, mLoadStart);
+    }
+
+    LOG(("  performing load, file=%p", mFile.get()));
+    if (NS_SUCCEEDED(rv)) {
+      rv = mFile->Init(fileKey, aTruncate, !mUseDisk, mSkipSizeCheck, aPriority,
+                       mPinned, directLoad ? nullptr : this);
+    }
+
+    if (NS_FAILED(rv)) {
+      mFileStatus = rv;
+      AsyncDoom(nullptr);
+      return false;
+    }
+  }
+
+  if (directLoad) {
+    // Just fake the load has already been done as "new".
+    mFileStatus = NS_OK;
+    mState = EMPTY;
+  }
+
+  return mState == LOADING;
+}
+
+NS_IMETHODIMP CacheEntry::OnFileReady(nsresult aResult, bool aIsNew) {
+  LOG(("CacheEntry::OnFileReady [this=%p, rv=0x%08" PRIx32 ", new=%d]", this,
+       static_cast<uint32_t>(aResult), aIsNew));
+
+  MOZ_ASSERT(!mLoadStart.IsNull());
+
+  if (NS_SUCCEEDED(aResult)) {
+    if (aIsNew) {
+      CacheFileUtils::DetailedCacheHitTelemetry::AddRecord(
+          CacheFileUtils::DetailedCacheHitTelemetry::MISS, mLoadStart);
+    } else {
+      CacheFileUtils::DetailedCacheHitTelemetry::AddRecord(
+          CacheFileUtils::DetailedCacheHitTelemetry::HIT, mLoadStart);
+    }
+  }
+
+  // OnFileReady, that is the only code that can transit from LOADING
+  // to any follow-on state and can only be invoked ones on an entry.
+  // Until this moment there is no consumer that could manipulate
+  // the entry state.
+
+  mozilla::MutexAutoLock lock(mLock);
+
+  MOZ_ASSERT(mState == LOADING);
+
+  mState = (aIsNew || NS_FAILED(aResult)) ? EMPTY : READY;
+
+  mFileStatus = aResult;
+
+  mPinned = mFile->IsPinned();
+
+  mPinningKnown = true;
+  LOG(("  pinning=%d", (bool)mPinned));
+
+  if (mState == READY) {
+    mHasData = true;
+
+    uint32_t frecency;
+    mFile->GetFrecency(&frecency);
+    // mFrecency is held in a double to increase computance precision.
+    // It is ok to persist frecency only as a uint32 with some math involved.
+    mFrecency = INT2FRECENCY(frecency);
+  }
+
+  InvokeCallbacks();
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP CacheEntry::OnFileDoomed(nsresult aResult) {
+  if (mDoomCallback) {
+    RefPtr<DoomCallbackRunnable> event =
+        new DoomCallbackRunnable(this, aResult);
+    NS_DispatchToMainThread(event);
+  }
+
+  return NS_OK;
+}
+
+already_AddRefed<CacheEntryHandle> CacheEntry::ReopenTruncated(
+    bool aMemoryOnly, nsICacheEntryOpenCallback* aCallback) {
+  LOG(("CacheEntry::ReopenTruncated [this=%p]", this));
+
+  mLock.AssertCurrentThreadOwns();
+
+  // Hold callbacks invocation, AddStorageEntry would invoke from doom
+  // prematurly
+  mPreventCallbacks = true;
+
+  RefPtr<CacheEntryHandle> handle;
+  RefPtr<CacheEntry> newEntry;
+  {
+    if (mPinned) {
+      MOZ_ASSERT(mUseDisk);
+      // We want to pin even no-store entries (the case we recreate a disk entry
+      // as a memory-only entry.)
+      aMemoryOnly = false;
+    }
+
+    mozilla::MutexAutoUnlock unlock(mLock);
+
+    // The following call dooms this entry (calls DoomAlreadyRemoved on us)
+    nsresult rv = CacheStorageService::Self()->AddStorageEntry(
+        GetStorageID(), GetURI(), GetEnhanceID(), mUseDisk && !aMemoryOnly,
+        mSkipSizeCheck, mPinned,
+        nsICacheStorage::OPEN_TRUNCATE,  // truncate existing (this one)
+        getter_AddRefs(handle));
+
+    if (NS_SUCCEEDED(rv)) {
+      newEntry = handle->Entry();
+      LOG(("  exchanged entry %p by entry %p, rv=0x%08" PRIx32, this,
+           newEntry.get(), static_cast<uint32_t>(rv)));
+      newEntry->AsyncOpen(aCallback, nsICacheStorage::OPEN_TRUNCATE);
+    } else {
+      LOG(("  exchanged of entry %p failed, rv=0x%08" PRIx32, this,
+           static_cast<uint32_t>(rv)));
+      AsyncDoom(nullptr);
+    }
+  }
+
+  mPreventCallbacks = false;
+
+  if (!newEntry) return nullptr;
+
+  newEntry->TransferCallbacks(*this);
+  mCallbacks.Clear();
+
+  // Must return a new write handle, since the consumer is expected to
+  // write to this newly recreated entry.  The |handle| is only a common
+  // reference counter and doesn't revert entry state back when write
+  // fails and also doesn't update the entry frecency.  Not updating
+  // frecency causes entries to not be purged from our memory pools.
+  RefPtr<CacheEntryHandle> writeHandle = newEntry->NewWriteHandle();
+  return writeHandle.forget();
+}
+
+void CacheEntry::TransferCallbacks(CacheEntry& aFromEntry) {
+  mozilla::MutexAutoLock lock(mLock);
+  aFromEntry.mLock.AssertCurrentThreadOwns();
+
+  LOG(("CacheEntry::TransferCallbacks [entry=%p, from=%p]", this, &aFromEntry));
+
+  if (!mCallbacks.Length()) {
+    mCallbacks.SwapElements(aFromEntry.mCallbacks);
+  } else {
+    mCallbacks.AppendElements(aFromEntry.mCallbacks);
+  }
+
+  uint32_t callbacksLength = mCallbacks.Length();
+  if (callbacksLength) {
+    // Carry the entry reference (unfortunately, needs to be done manually...)
+    for (uint32_t i = 0; i < callbacksLength; ++i) {
+      mCallbacks[i].ExchangeEntry(this);
+    }
+
+    BackgroundOp(Ops::CALLBACKS, true);
+  }
+}
+
+void CacheEntry::RememberCallback(Callback& aCallback) {
+  mLock.AssertCurrentThreadOwns();
+
+  LOG(("CacheEntry::RememberCallback [this=%p, cb=%p, state=%s]", this,
+       aCallback.mCallback.get(), StateString(mState)));
+
+  mCallbacks.AppendElement(aCallback);
+}
+
+void CacheEntry::InvokeCallbacksLock() {
+  mozilla::MutexAutoLock lock(mLock);
+  InvokeCallbacks();
+}
+
+void CacheEntry::InvokeCallbacks() {
+  mLock.AssertCurrentThreadOwns();
+
+  LOG(("CacheEntry::InvokeCallbacks BEGIN [this=%p]", this));
+
+  // Invoke first all r/w callbacks, then all r/o callbacks.
+  if (InvokeCallbacks(false)) InvokeCallbacks(true);
+
+  LOG(("CacheEntry::InvokeCallbacks END [this=%p]", this));
+}
+
+bool CacheEntry::InvokeCallbacks(bool aReadOnly) {
+  mLock.AssertCurrentThreadOwns();
+
+  RefPtr<CacheEntryHandle> recreatedHandle;
+
+  uint32_t i = 0;
+  while (i < mCallbacks.Length()) {
+    if (mPreventCallbacks) {
+      LOG(("  callbacks prevented!"));
+      return false;
+    }
+
+    if (!mIsDoomed && (mState == WRITING || mState == REVALIDATING)) {
+      LOG(("  entry is being written/revalidated"));
+      return false;
+    }
+
+    bool recreate;
+    if (mCallbacks[i].DeferDoom(&recreate)) {
+      mCallbacks.RemoveElementAt(i);
+      if (!recreate) {
+        continue;
+      }
+
+      LOG(("  defer doom marker callback hit positive, recreating"));
+      recreatedHandle = ReopenTruncated(!mUseDisk, nullptr);
+      break;
+    }
+
+    if (mCallbacks[i].mReadOnly != aReadOnly) {
+      // Callback is not r/w or r/o, go to another one in line
+      ++i;
+      continue;
+    }
+
+    bool onCheckThread;
+    nsresult rv = mCallbacks[i].OnCheckThread(&onCheckThread);
+
+    if (NS_SUCCEEDED(rv) && !onCheckThread) {
+      // Redispatch to the target thread
+      rv = mCallbacks[i].mTarget->Dispatch(
+          NewRunnableMethod("net::CacheEntry::InvokeCallbacksLock", this,
+                            &CacheEntry::InvokeCallbacksLock),
+          nsIEventTarget::DISPATCH_NORMAL);
+      if (NS_SUCCEEDED(rv)) {
+        LOG(("  re-dispatching to target thread"));
+        return false;
+      }
+    }
+
+    Callback callback = mCallbacks[i];
+    mCallbacks.RemoveElementAt(i);
+
+    if (NS_SUCCEEDED(rv) && !InvokeCallback(callback)) {
+      // Callback didn't fire, put it back and go to another one in line.
+      // Only reason InvokeCallback returns false is that onCacheEntryCheck
+      // returns RECHECK_AFTER_WRITE_FINISHED.  If we would stop the loop, other
+      // readers or potential writers would be unnecessarily kept from being
+      // invoked.
+      size_t pos = std::min(mCallbacks.Length(), static_cast<size_t>(i));
+      mCallbacks.InsertElementAt(pos, callback);
+      ++i;
+    }
+  }
+
+  if (recreatedHandle) {
+    // Must be released outside of the lock, enters InvokeCallback on the new
+    // entry
+    mozilla::MutexAutoUnlock unlock(mLock);
+    recreatedHandle = nullptr;
+  }
+
+  return true;
+}
+
+bool CacheEntry::InvokeCallback(Callback& aCallback) {
+  mLock.AssertCurrentThreadOwns();
+  LOG(("CacheEntry::InvokeCallback [this=%p, state=%s, cb=%p]", this,
+       StateString(mState), aCallback.mCallback.get()));
+
+  // When this entry is doomed we want to notify the callback any time
+  if (!mIsDoomed) {
+    // When we are here, the entry must be loaded from disk
+    MOZ_ASSERT(mState > LOADING);
+
+    if (mState == WRITING || mState == REVALIDATING) {
+      // Prevent invoking other callbacks since one of them is now writing
+      // or revalidating this entry.  No consumers should get this entry
+      // until metadata are filled with values downloaded from the server
+      // or the entry revalidated and output stream has been opened.
+      LOG(("  entry is being written/revalidated, callback bypassed"));
+      return false;
+    }
+
+    // mRecheckAfterWrite flag already set means the callback has already passed
+    // the onCacheEntryCheck call. Until the current write is not finished this
+    // callback will be bypassed.
+    if (!aCallback.mRecheckAfterWrite) {
+      if (!aCallback.mReadOnly) {
+        if (mState == EMPTY) {
+          // Advance to writing state, we expect to invoke the callback and let
+          // it fill content of this entry.  Must set and check the state here
+          // to prevent more then one
+          mState = WRITING;
+          LOG(("  advancing to WRITING state"));
+        }
+
+        if (!aCallback.mCallback) {
+          // We can be given no callback only in case of recreate, it is ok
+          // to advance to WRITING state since the caller of recreate is
+          // expected to write this entry now.
+          return true;
+        }
+      }
+
+      if (mState == READY) {
+        // Metadata present, validate the entry
+        uint32_t checkResult;
+        {
+          // mayhemer: TODO check and solve any potential races of concurent
+          // OnCacheEntryCheck
+          mozilla::MutexAutoUnlock unlock(mLock);
+
+          RefPtr<CacheEntryHandle> handle = NewHandle();
+
+          nsresult rv =
+              aCallback.mCallback->OnCacheEntryCheck(handle, &checkResult);
+          LOG(("  OnCacheEntryCheck: rv=0x%08" PRIx32 ", result=%" PRId32,
+               static_cast<uint32_t>(rv), static_cast<uint32_t>(checkResult)));
+
+          if (NS_FAILED(rv)) checkResult = ENTRY_NOT_WANTED;
+        }
+
+        aCallback.mRevalidating = checkResult == ENTRY_NEEDS_REVALIDATION;
+
+        switch (checkResult) {
+          case ENTRY_WANTED:
+            // Nothing more to do here, the consumer is responsible to handle
+            // the result of OnCacheEntryCheck it self.
+            // Proceed to callback...
+            break;
+
+          case RECHECK_AFTER_WRITE_FINISHED:
+            LOG(
+                ("  consumer will check on the entry again after write is "
+                 "done"));
+            // The consumer wants the entry to complete first.
+            aCallback.mRecheckAfterWrite = true;
+            break;
+
+          case ENTRY_NEEDS_REVALIDATION:
+            LOG(("  will be holding callbacks until entry is revalidated"));
+            // State is READY now and from that state entry cannot transit to
+            // any other state then REVALIDATING for which cocurrency is not an
+            // issue.  Potentially no need to lock here.
+            mState = REVALIDATING;
+            break;
+
+          case ENTRY_NOT_WANTED:
+            LOG(("  consumer not interested in the entry"));
+            // Do not give this entry to the consumer, it is not interested in
+            // us.
+            aCallback.mNotWanted = true;
+            break;
+        }
+      }
+    }
+  }
+
+  if (aCallback.mCallback) {
+    if (!mIsDoomed && aCallback.mRecheckAfterWrite) {
+      // If we don't have data and the callback wants a complete entry,
+      // don't invoke now.
+      bool bypass = !mHasData;
+      if (!bypass && NS_SUCCEEDED(mFileStatus)) {
+        int64_t _unused;
+        bypass = !mFile->DataSize(&_unused);
+      }
+
+      if (bypass) {
+        LOG(("  bypassing, entry data still being written"));
+        return false;
+      }
+
+      // Entry is complete now, do the check+avail call again
+      aCallback.mRecheckAfterWrite = false;
+      return InvokeCallback(aCallback);
+    }
+
+    mozilla::MutexAutoUnlock unlock(mLock);
+    InvokeAvailableCallback(aCallback);
+  }
+
+  return true;
+}
+
+void CacheEntry::InvokeAvailableCallback(Callback const& aCallback) {
+  nsresult rv;
+  uint32_t state;
+  {
+    mozilla::MutexAutoLock lock(mLock);
+    state = mState;
+    LOG(
+        ("CacheEntry::InvokeAvailableCallback [this=%p, state=%s, cb=%p, "
+         "r/o=%d, "
+         "n/w=%d]",
+         this, StateString(mState), aCallback.mCallback.get(),
+         aCallback.mReadOnly, aCallback.mNotWanted));
+
+    // When we are here, the entry must be loaded from disk
+    MOZ_ASSERT(state > LOADING || mIsDoomed);
+  }
+
+  bool onAvailThread;
+  rv = aCallback.OnAvailThread(&onAvailThread);
+  if (NS_FAILED(rv)) {
+    LOG(("  target thread dead?"));
+    return;
+  }
+
+  if (!onAvailThread) {
+    // Dispatch to the right thread
+    RefPtr<AvailableCallbackRunnable> event =
+        new AvailableCallbackRunnable(this, aCallback);
+
+    rv = aCallback.mTarget->Dispatch(event, nsIEventTarget::DISPATCH_NORMAL);
+    LOG(("  redispatched, (rv = 0x%08" PRIx32 ")", static_cast<uint32_t>(rv)));
+    return;
+  }
+
+  if (mIsDoomed || aCallback.mNotWanted) {
+    LOG(
+        ("  doomed or not wanted, notifying OCEA with "
+         "NS_ERROR_CACHE_KEY_NOT_FOUND"));
+    aCallback.mCallback->OnCacheEntryAvailable(nullptr, false,
+                                               NS_ERROR_CACHE_KEY_NOT_FOUND);
+    return;
+  }
+
+  if (state == READY) {
+    LOG(("  ready/has-meta, notifying OCEA with entry and NS_OK"));
+
+    if (!aCallback.mSecret) {
+      mozilla::MutexAutoLock lock(mLock);
+      BackgroundOp(Ops::FRECENCYUPDATE);
+    }
+
+    OnFetched(aCallback);
+
+    RefPtr<CacheEntryHandle> handle = NewHandle();
+    aCallback.mCallback->OnCacheEntryAvailable(handle, false, NS_OK);
+    return;
+  }
+
+  // R/O callbacks may do revalidation, let them fall through
+  if (aCallback.mReadOnly && !aCallback.mRevalidating) {
+    LOG(
+        ("  r/o and not ready, notifying OCEA with "
+         "NS_ERROR_CACHE_KEY_NOT_FOUND"));
+    aCallback.mCallback->OnCacheEntryAvailable(nullptr, false,
+                                               NS_ERROR_CACHE_KEY_NOT_FOUND);
+    return;
+  }
+
+  // This is a new or potentially non-valid entry and needs to be fetched first.
+  // The CacheEntryHandle blocks other consumers until the channel
+  // either releases the entry or marks metadata as filled or whole entry valid,
+  // i.e. until MetaDataReady() or SetValid() on the entry is called
+  // respectively.
+
+  // Consumer will be responsible to fill or validate the entry metadata and
+  // data.
+
+  OnFetched(aCallback);
+
+  RefPtr<CacheEntryHandle> handle = NewWriteHandle();
+  rv = aCallback.mCallback->OnCacheEntryAvailable(handle, state == WRITING,
+                                                  NS_OK);
+
+  if (NS_FAILED(rv)) {
+    LOG(("  writing/revalidating failed (0x%08" PRIx32 ")",
+         static_cast<uint32_t>(rv)));
+
+    // Consumer given a new entry failed to take care of the entry.
+    OnHandleClosed(handle);
+    return;
+  }
+
+  LOG(("  writing/revalidating"));
+}
+
+void CacheEntry::OnFetched(Callback const& aCallback) {
+  if (NS_SUCCEEDED(mFileStatus) && !aCallback.mSecret) {
+    // Let the last-fetched and fetch-count properties be updated.
+    mFile->OnFetched();
+  }
+}
+
+CacheEntryHandle* CacheEntry::NewHandle() { return new CacheEntryHandle(this); }
+
+CacheEntryHandle* CacheEntry::NewWriteHandle() {
+  mozilla::MutexAutoLock lock(mLock);
+
+  // Ignore the OPEN_SECRETLY flag on purpose here, which should actually be
+  // used only along with OPEN_READONLY, but there is no need to enforce that.
+  BackgroundOp(Ops::FRECENCYUPDATE);
+
+  return (mWriter = NewHandle());
+}
+
+void CacheEntry::OnHandleClosed(CacheEntryHandle const* aHandle) {
+  mozilla::MutexAutoLock lock(mLock);
+  LOG(("CacheEntry::OnHandleClosed [this=%p, state=%s, handle=%p]", this,
+       StateString(mState), aHandle));
+
+  if (mIsDoomed && NS_SUCCEEDED(mFileStatus) &&
+      // Note: mHandlesCount is dropped before this method is called
+      (mHandlesCount == 0 ||
+       (mHandlesCount == 1 && mWriter && mWriter != aHandle))) {
+    // This entry is no longer referenced from outside and is doomed.
+    // We can do this also when there is just reference from the writer,
+    // no one else could ever reach the written data.
+    // Tell the file to kill the handle, i.e. bypass any I/O operations
+    // on it except removing the file.
+    mFile->Kill();
+  }
+
+  if (mWriter != aHandle) {
+    LOG(("  not the writer"));
+    return;
+  }
+
+  if (mOutputStream) {
+    LOG(("  abandoning phantom output stream"));
+    // No one took our internal output stream, so there are no data
+    // and output stream has to be open symultaneously with input stream
+    // on this entry again.
+    mHasData = false;
+    // This asynchronously ends up invoking callbacks on this entry
+    // through OnOutputClosed() call.
+    mOutputStream->Close();
+    mOutputStream = nullptr;
+  } else {
+    // We must always redispatch, otherwise there is a risk of stack
+    // overflow.  This code can recurse deeply.  It won't execute sooner
+    // than we release mLock.
+    BackgroundOp(Ops::CALLBACKS, true);
+  }
+
+  mWriter = nullptr;
+
+  if (mState == WRITING) {
+    LOG(("  reverting to state EMPTY - write failed"));
+    mState = EMPTY;
+  } else if (mState == REVALIDATING) {
+    LOG(("  reverting to state READY - reval failed"));
+    mState = READY;
+  }
+
+  if (mState == READY && !mHasData) {
+    // We may get to this state when following steps happen:
+    // 1. a new entry is given to a consumer
+    // 2. the consumer calls MetaDataReady(), we transit to READY
+    // 3. abandons the entry w/o opening the output stream, mHasData left false
+    //
+    // In this case any following consumer will get a ready entry (with
+    // metadata) but in state like the entry data write was still happening (was
+    // in progress) and will indefinitely wait for the entry data or even the
+    // entry itself when RECHECK_AFTER_WRITE is returned from onCacheEntryCheck.
+    LOG(
+        ("  we are in READY state, pretend we have data regardless it"
+         " has actully been never touched"));
+    mHasData = true;
+  }
+}
+
+void CacheEntry::OnOutputClosed() {
+  // Called when the file's output stream is closed.  Invoke any callbacks
+  // waiting for complete entry.
+
+  mozilla::MutexAutoLock lock(mLock);
+  InvokeCallbacks();
+}
+
+bool CacheEntry::IsReferenced() const {
+  CacheStorageService::Self()->Lock().AssertCurrentThreadOwns();
+
+  // Increasing this counter from 0 to non-null and this check both happen only
+  // under the service lock.
+  return mHandlesCount > 0;
+}
+
+bool CacheEntry::IsFileDoomed() {
+  if (NS_SUCCEEDED(mFileStatus)) {
+    return mFile->IsDoomed();
+  }
+
+  return false;
+}
+
+uint32_t CacheEntry::GetMetadataMemoryConsumption() {
+  NS_ENSURE_SUCCESS(mFileStatus, 0);
+
+  uint32_t size;
+  if (NS_FAILED(mFile->ElementsSize(&size))) return 0;
+
+  return size;
+}
+
+// nsICacheEntry
+
+nsresult CacheEntry::GetPersistent(bool* aPersistToDisk) {
+  // No need to sync when only reading.
+  // When consumer needs to be consistent with state of the memory storage
+  // entries table, then let it use GetUseDisk getter that must be called under
+  // the service lock.
+  *aPersistToDisk = mUseDisk;
+  return NS_OK;
+}
+
+nsresult CacheEntry::GetKey(nsACString& aKey) {
+  aKey.Assign(mURI);
+  return NS_OK;
+}
+
+nsresult CacheEntry::GetCacheEntryId(uint64_t* aCacheEntryId) {
+  *aCacheEntryId = mCacheEntryId;
+  return NS_OK;
+}
+
+nsresult CacheEntry::GetFetchCount(uint32_t* aFetchCount) {
+  NS_ENSURE_SUCCESS(mFileStatus, NS_ERROR_NOT_AVAILABLE);
+
+  return mFile->GetFetchCount(aFetchCount);
+}
+
+nsresult CacheEntry::GetLastFetched(uint32_t* aLastFetched) {
+  NS_ENSURE_SUCCESS(mFileStatus, NS_ERROR_NOT_AVAILABLE);
+
+  return mFile->GetLastFetched(aLastFetched);
+}
+
+nsresult CacheEntry::GetLastModified(uint32_t* aLastModified) {
+  NS_ENSURE_SUCCESS(mFileStatus, NS_ERROR_NOT_AVAILABLE);
+
+  return mFile->GetLastModified(aLastModified);
+}
+
+nsresult CacheEntry::GetExpirationTime(uint32_t* aExpirationTime) {
+  NS_ENSURE_SUCCESS(mFileStatus, NS_ERROR_NOT_AVAILABLE);
+
+  return mFile->GetExpirationTime(aExpirationTime);
+}
+
+nsresult CacheEntry::GetOnStartTime(uint64_t* aTime) {
+  NS_ENSURE_SUCCESS(mFileStatus, NS_ERROR_NOT_AVAILABLE);
+  return mFile->GetOnStartTime(aTime);
+}
+
+nsresult CacheEntry::GetOnStopTime(uint64_t* aTime) {
+  NS_ENSURE_SUCCESS(mFileStatus, NS_ERROR_NOT_AVAILABLE);
+  return mFile->GetOnStopTime(aTime);
+}
+
+nsresult CacheEntry::SetNetworkTimes(uint64_t aOnStartTime,
+                                     uint64_t aOnStopTime) {
+  if (NS_SUCCEEDED(mFileStatus)) {
+    return mFile->SetNetworkTimes(aOnStartTime, aOnStopTime);
+  }
+  return NS_ERROR_NOT_AVAILABLE;
+}
+
+nsresult CacheEntry::SetContentType(uint8_t aContentType) {
+  NS_ENSURE_ARG_MAX(aContentType, nsICacheEntry::CONTENT_TYPE_LAST - 1);
+
+  if (NS_SUCCEEDED(mFileStatus)) {
+    return mFile->SetContentType(aContentType);
+  }
+  return NS_ERROR_NOT_AVAILABLE;
+}
+
+nsresult CacheEntry::GetIsForcedValid(bool* aIsForcedValid) {
+  NS_ENSURE_ARG(aIsForcedValid);
+
+#ifdef DEBUG
+  {
+    mozilla::MutexAutoLock lock(mLock);
+    MOZ_ASSERT(mState > LOADING);
+  }
+#endif
+  if (mPinned) {
+    *aIsForcedValid = true;
+    return NS_OK;
+  }
+
+  nsAutoCString key;
+  nsresult rv = HashingKey(key);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  *aIsForcedValid =
+      CacheStorageService::Self()->IsForcedValidEntry(mStorageID, key);
+  LOG(("CacheEntry::GetIsForcedValid [this=%p, IsForcedValid=%d]", this,
+       *aIsForcedValid));
+
+  return NS_OK;
+}
+
+nsresult CacheEntry::ForceValidFor(uint32_t aSecondsToTheFuture) {
+  LOG(("CacheEntry::ForceValidFor [this=%p, aSecondsToTheFuture=%d]", this,
+       aSecondsToTheFuture));
+
+  nsAutoCString key;
+  nsresult rv = HashingKey(key);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  CacheStorageService::Self()->ForceEntryValidFor(mStorageID, key,
+                                                  aSecondsToTheFuture);
+
+  return NS_OK;
+}
+
+nsresult CacheEntry::MarkForcedValidUse() {
+  LOG(("CacheEntry::MarkForcedValidUse [this=%p, ]", this));
+
+  nsAutoCString key;
+  nsresult rv = HashingKey(key);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  CacheStorageService::Self()->MarkForcedValidEntryUse(mStorageID, key);
+  return NS_OK;
+}
+
+nsresult CacheEntry::SetExpirationTime(uint32_t aExpirationTime) {
+  NS_ENSURE_SUCCESS(mFileStatus, NS_ERROR_NOT_AVAILABLE);
+
+  nsresult rv = mFile->SetExpirationTime(aExpirationTime);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Aligned assignment, thus atomic.
+  mSortingExpirationTime = aExpirationTime;
+  return NS_OK;
+}
+
+nsresult CacheEntry::OpenInputStream(int64_t offset, nsIInputStream** _retval) {
+  LOG(("CacheEntry::OpenInputStream [this=%p]", this));
+  return OpenInputStreamInternal(offset, nullptr, _retval);
+}
+
+nsresult CacheEntry::OpenAlternativeInputStream(const nsACString& type,
+                                                nsIInputStream** _retval) {
+  LOG(("CacheEntry::OpenAlternativeInputStream [this=%p, type=%s]", this,
+       PromiseFlatCString(type).get()));
+  return OpenInputStreamInternal(0, PromiseFlatCString(type).get(), _retval);
+}
+
+nsresult CacheEntry::OpenInputStreamInternal(int64_t offset,
+                                             const char* aAltDataType,
+                                             nsIInputStream** _retval) {
+  LOG(("CacheEntry::OpenInputStreamInternal [this=%p]", this));
+
+  NS_ENSURE_SUCCESS(mFileStatus, NS_ERROR_NOT_AVAILABLE);
+
+  nsresult rv;
+
+  RefPtr<CacheEntryHandle> selfHandle = NewHandle();
+
+  nsCOMPtr<nsIInputStream> stream;
+  if (aAltDataType) {
+    rv = mFile->OpenAlternativeInputStream(selfHandle, aAltDataType,
+                                           getter_AddRefs(stream));
+    if (NS_FAILED(rv)) {
+      // Failure of this method may be legal when the alternative data requested
+      // is not avaialble or of a different type.  Console error logs are
+      // ensured by CacheFile::OpenAlternativeInputStream.
+      return rv;
+    }
+  } else {
+    rv = mFile->OpenInputStream(selfHandle, getter_AddRefs(stream));
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  nsCOMPtr<nsISeekableStream> seekable = do_QueryInterface(stream, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET, offset);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  mozilla::MutexAutoLock lock(mLock);
+
+  if (!mHasData) {
+    // So far output stream on this new entry not opened, do it now.
+    LOG(("  creating phantom output stream"));
+    rv = OpenOutputStreamInternal(0, getter_AddRefs(mOutputStream));
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  stream.forget(_retval);
+  return NS_OK;
+}
+
+nsresult CacheEntry::OpenOutputStream(int64_t offset, int64_t predictedSize,
+                                      nsIOutputStream** _retval) {
+  LOG(("CacheEntry::OpenOutputStream [this=%p]", this));
+
+  nsresult rv;
+
+  mozilla::MutexAutoLock lock(mLock);
+
+  MOZ_ASSERT(mState > EMPTY);
+
+  if (mFile->EntryWouldExceedLimit(0, predictedSize, false)) {
+    LOG(("  entry would exceed size limit"));
+    return NS_ERROR_FILE_TOO_BIG;
+  }
+
+  if (mOutputStream && !mIsDoomed) {
+    LOG(("  giving phantom output stream"));
+    mOutputStream.forget(_retval);
+  } else {
+    rv = OpenOutputStreamInternal(offset, _retval);
+    if (NS_FAILED(rv)) return rv;
+  }
+
+  // Entry considered ready when writer opens output stream.
+  if (mState < READY) mState = READY;
+
+  // Invoke any pending readers now.
+  InvokeCallbacks();
+
+  return NS_OK;
+}
+
+nsresult CacheEntry::OpenAlternativeOutputStream(
+    const nsACString& type, int64_t predictedSize,
+    nsIAsyncOutputStream** _retval) {
+  LOG(("CacheEntry::OpenAlternativeOutputStream [this=%p, type=%s]", this,
+       PromiseFlatCString(type).get()));
+
+  nsresult rv;
+
+  if (type.IsEmpty()) {
+    // The empty string is reserved to mean no alt-data available.
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  mozilla::MutexAutoLock lock(mLock);
+
+  if (!mHasData || mState < READY || mOutputStream || mIsDoomed) {
+    LOG(("  entry not in state to write alt-data"));
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  if (mFile->EntryWouldExceedLimit(0, predictedSize, true)) {
+    LOG(("  entry would exceed size limit"));
+    return NS_ERROR_FILE_TOO_BIG;
+  }
+
+  nsCOMPtr<nsIAsyncOutputStream> stream;
+  rv = mFile->OpenAlternativeOutputStream(
+      nullptr, PromiseFlatCString(type).get(), getter_AddRefs(stream));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  stream.swap(*_retval);
+  return NS_OK;
+}
+
+nsresult CacheEntry::OpenOutputStreamInternal(int64_t offset,
+                                              nsIOutputStream** _retval) {
+  LOG(("CacheEntry::OpenOutputStreamInternal [this=%p]", this));
+
+  NS_ENSURE_SUCCESS(mFileStatus, NS_ERROR_NOT_AVAILABLE);
+
+  mLock.AssertCurrentThreadOwns();
+
+  if (mIsDoomed) {
+    LOG(("  doomed..."));
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  MOZ_ASSERT(mState > LOADING);
+
+  nsresult rv;
+
+  // No need to sync on mUseDisk here, we don't need to be consistent
+  // with content of the memory storage entries hash table.
+  if (!mUseDisk) {
+    rv = mFile->SetMemoryOnly();
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  RefPtr<CacheOutputCloseListener> listener =
+      new CacheOutputCloseListener(this);
+
+  nsCOMPtr<nsIOutputStream> stream;
+  rv = mFile->OpenOutputStream(listener, getter_AddRefs(stream));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsISeekableStream> seekable = do_QueryInterface(stream, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET, offset);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Prevent opening output stream again.
+  mHasData = true;
+
+  stream.swap(*_retval);
+  return NS_OK;
+}
+
+nsresult CacheEntry::GetSecurityInfo(nsITransportSecurityInfo** aSecurityInfo) {
+  {
+    mozilla::MutexAutoLock lock(mLock);
+    if (mSecurityInfoLoaded) {
+      *aSecurityInfo = do_AddRef(mSecurityInfo).take();
+      return NS_OK;
+    }
+  }
+
+  NS_ENSURE_SUCCESS(mFileStatus, NS_ERROR_NOT_AVAILABLE);
+
+  nsCString info;
+  nsresult rv = mFile->GetElement("security-info", getter_Copies(info));
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr<nsITransportSecurityInfo> securityInfo;
+  if (!info.IsVoid()) {
+    rv = mozilla::psm::TransportSecurityInfo::Read(
+        info, getter_AddRefs(securityInfo));
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+  if (!securityInfo) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  {
+    mozilla::MutexAutoLock lock(mLock);
+
+    mSecurityInfo.swap(securityInfo);
+    mSecurityInfoLoaded = true;
+
+    *aSecurityInfo = do_AddRef(mSecurityInfo).take();
+  }
+
+  return NS_OK;
+}
+
+nsresult CacheEntry::SetSecurityInfo(nsITransportSecurityInfo* aSecurityInfo) {
+  nsresult rv;
+
+  NS_ENSURE_SUCCESS(mFileStatus, mFileStatus);
+
+  {
+    mozilla::MutexAutoLock lock(mLock);
+
+    mSecurityInfo = aSecurityInfo;
+    mSecurityInfoLoaded = true;
+  }
+
+  nsCString info;
+  if (aSecurityInfo) {
+    rv = aSecurityInfo->ToString(info);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  rv = mFile->SetElement("security-info", info.Length() ? info.get() : nullptr);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return NS_OK;
+}
+
+nsresult CacheEntry::GetStorageDataSize(uint32_t* aStorageDataSize) {
+  NS_ENSURE_ARG(aStorageDataSize);
+
+  int64_t dataSize;
+  nsresult rv = GetDataSize(&dataSize);
+  if (NS_FAILED(rv)) return rv;
+
+  *aStorageDataSize = (uint32_t)std::min(int64_t(uint32_t(-1)), dataSize);
+
+  return NS_OK;
+}
+
+nsresult CacheEntry::AsyncDoom(nsICacheEntryDoomCallback* aCallback) {
+  LOG(("CacheEntry::AsyncDoom [this=%p]", this));
+
+  {
+    mozilla::MutexAutoLock lock(mLock);
+
+    if (mIsDoomed || mDoomCallback) {
+      return NS_ERROR_IN_PROGRESS;  // to aggregate have DOOMING state
+    }
+
+    RemoveForcedValidity();
+
+    mIsDoomed = true;
+    mDoomCallback = aCallback;
+  }
+
+  // This immediately removes the entry from the master hashtable and also
+  // immediately dooms the file.  This way we make sure that any consumer
+  // after this point asking for the same entry won't get
+  //   a) this entry
+  //   b) a new entry with the same file
+  PurgeAndDoom();
+
+  return NS_OK;
+}
+
+nsresult CacheEntry::GetMetaDataElement(const char* aKey, char** aRetval) {
+  NS_ENSURE_SUCCESS(mFileStatus, NS_ERROR_NOT_AVAILABLE);
+
+  return mFile->GetElement(aKey, aRetval);
+}
+
+nsresult CacheEntry::SetMetaDataElement(const char* aKey, const char* aValue) {
+  NS_ENSURE_SUCCESS(mFileStatus, NS_ERROR_NOT_AVAILABLE);
+
+  return mFile->SetElement(aKey, aValue);
+}
+
+nsresult CacheEntry::VisitMetaData(nsICacheEntryMetaDataVisitor* aVisitor) {
+  NS_ENSURE_SUCCESS(mFileStatus, NS_ERROR_NOT_AVAILABLE);
+
+  return mFile->VisitMetaData(aVisitor);
+}
+
+nsresult CacheEntry::MetaDataReady() {
+  mozilla::MutexAutoLock lock(mLock);
+
+  LOG(("CacheEntry::MetaDataReady [this=%p, state=%s]", this,
+       StateString(mState)));
+
+  MOZ_ASSERT(mState > EMPTY);
+
+  if (mState == WRITING) mState = READY;
+
+  InvokeCallbacks();
+
+  return NS_OK;
+}
+
+nsresult CacheEntry::SetValid() {
+  nsCOMPtr<nsIOutputStream> outputStream;
+
+  {
+    mozilla::MutexAutoLock lock(mLock);
+    LOG(("CacheEntry::SetValid [this=%p, state=%s]", this,
+         StateString(mState)));
+
+    MOZ_ASSERT(mState > EMPTY);
+
+    mState = READY;
+    mHasData = true;
+
+    InvokeCallbacks();
+
+    outputStream.swap(mOutputStream);
+  }
+
+  if (outputStream) {
+    LOG(("  abandoning phantom output stream"));
+    outputStream->Close();
+  }
+
+  return NS_OK;
+}
+
+nsresult CacheEntry::Recreate(bool aMemoryOnly, nsICacheEntry** _retval) {
+  mozilla::MutexAutoLock lock(mLock);
+  LOG(("CacheEntry::Recreate [this=%p, state=%s]", this, StateString(mState)));
+
+  RefPtr<CacheEntryHandle> handle = ReopenTruncated(aMemoryOnly, nullptr);
+  if (handle) {
+    handle.forget(_retval);
+    return NS_OK;
+  }
+
+  BackgroundOp(Ops::CALLBACKS, true);
+  return NS_ERROR_NOT_AVAILABLE;
+}
+
+nsresult CacheEntry::GetDataSize(int64_t* aDataSize) {
+  LOG(("CacheEntry::GetDataSize [this=%p]", this));
+  *aDataSize = 0;
+
+  {
+    mozilla::MutexAutoLock lock(mLock);
+
+    if (!mHasData) {
+      LOG(("  write in progress (no data)"));
+      return NS_ERROR_IN_PROGRESS;
+    }
+  }
+
+  NS_ENSURE_SUCCESS(mFileStatus, mFileStatus);
+
+  // mayhemer: TODO Problem with compression?
+  if (!mFile->DataSize(aDataSize)) {
+    LOG(("  write in progress (stream active)"));
+    return NS_ERROR_IN_PROGRESS;
+  }
+
+  LOG(("  size=%" PRId64, *aDataSize));
+  return NS_OK;
+}
+
+nsresult CacheEntry::GetAltDataSize(int64_t* aDataSize) {
+  LOG(("CacheEntry::GetAltDataSize [this=%p]", this));
+  if (NS_FAILED(mFileStatus)) {
+    return mFileStatus;
+  }
+  return mFile->GetAltDataSize(aDataSize);
+}
+
+nsresult CacheEntry::GetAltDataType(nsACString& aType) {
+  LOG(("CacheEntry::GetAltDataType [this=%p]", this));
+  if (NS_FAILED(mFileStatus)) {
+    return mFileStatus;
+  }
+  return mFile->GetAltDataType(aType);
+}
+
+nsresult CacheEntry::MarkValid() {
+  // NOT IMPLEMENTED ACTUALLY
+  return NS_OK;
+}
+
+nsresult CacheEntry::MaybeMarkValid() {
+  // NOT IMPLEMENTED ACTUALLY
+  return NS_OK;
+}
+
+nsresult CacheEntry::HasWriteAccess(bool aWriteAllowed, bool* aWriteAccess) {
+  *aWriteAccess = aWriteAllowed;
+  return NS_OK;
+}
+
+nsresult CacheEntry::Close() {
+  // NOT IMPLEMENTED ACTUALLY
+  return NS_OK;
+}
+
+nsresult CacheEntry::GetDiskStorageSizeInKB(uint32_t* aDiskStorageSize) {
+  if (NS_FAILED(mFileStatus)) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  return mFile->GetDiskStorageSizeInKB(aDiskStorageSize);
+}
+
+nsresult CacheEntry::GetLoadContextInfo(nsILoadContextInfo** aInfo) {
+  nsCOMPtr<nsILoadContextInfo> info = CacheFileUtils::ParseKey(mStorageID);
+  if (!info) {
+    return NS_ERROR_FAILURE;
+  }
+
+  info.forget(aInfo);
+
+  return NS_OK;
+}
+
+// nsIRunnable
+
+NS_IMETHODIMP CacheEntry::Run() {
+  MOZ_ASSERT(CacheStorageService::IsOnManagementThread());
+
+  mozilla::MutexAutoLock lock(mLock);
+
+  BackgroundOp(mBackgroundOperations.Grab());
+  return NS_OK;
+}
+
+// Management methods
+
+double CacheEntry::GetFrecency() const {
+  MOZ_ASSERT(CacheStorageService::IsOnManagementThread());
+  return mFrecency;
+}
+
+uint32_t CacheEntry::GetExpirationTime() const {
+  MOZ_ASSERT(CacheStorageService::IsOnManagementThread());
+  return mSortingExpirationTime;
+}
+
+bool CacheEntry::IsRegistered() const {
+  MOZ_ASSERT(CacheStorageService::IsOnManagementThread());
+  return mRegistration == REGISTERED;
+}
+
+bool CacheEntry::CanRegister() const {
+  MOZ_ASSERT(CacheStorageService::IsOnManagementThread());
+  return mRegistration == NEVERREGISTERED;
+}
+
+void CacheEntry::SetRegistered(bool aRegistered) {
+  MOZ_ASSERT(CacheStorageService::IsOnManagementThread());
+
+  if (aRegistered) {
+    MOZ_ASSERT(mRegistration == NEVERREGISTERED);
+    mRegistration = REGISTERED;
+  } else {
+    MOZ_ASSERT(mRegistration == REGISTERED);
+    mRegistration = DEREGISTERED;
+  }
+}
+
+bool CacheEntry::DeferOrBypassRemovalOnPinStatus(bool aPinned) {
+  LOG(("CacheEntry::DeferOrBypassRemovalOnPinStatus [this=%p]", this));
+
+  mozilla::MutexAutoLock lock(mLock);
+  if (mPinningKnown) {
+    LOG(("  pinned=%d, caller=%d", (bool)mPinned, aPinned));
+    // Bypass when the pin status of this entry doesn't match the pin status
+    // caller wants to remove
+    return mPinned != aPinned;
+  }
+
+  LOG(("  pinning unknown, caller=%d", aPinned));
+  // Oterwise, remember to doom after the status is determined for any
+  // callback opening the entry after this point...
+  Callback c(this, aPinned);
+  RememberCallback(c);
+  // ...and always bypass
+  return true;
+}
+
+bool CacheEntry::Purge(uint32_t aWhat) {
+  LOG(("CacheEntry::Purge [this=%p, what=%d]", this, aWhat));
+
+  MOZ_ASSERT(CacheStorageService::IsOnManagementThread());
+
+  switch (aWhat) {
+    case PURGE_DATA_ONLY_DISK_BACKED:
+    case PURGE_WHOLE_ONLY_DISK_BACKED:
+      // This is an in-memory only entry, don't purge it
+      if (!mUseDisk) {
+        LOG(("  not using disk"));
+        return false;
+      }
+  }
+
+  {
+    mozilla::MutexAutoLock lock(mLock);
+
+    if (mState == WRITING || mState == LOADING || mFrecency == 0) {
+      // In-progress (write or load) entries should (at least for consistency
+      // and from the logical point of view) stay in memory. Zero-frecency
+      // entries are those which have never been given to any consumer, those
+      // are actually very fresh and should not go just because frecency had not
+      // been set so far.
+      LOG(("  state=%s, frecency=%1.10f", StateString(mState), mFrecency));
+      return false;
+    }
+  }
+
+  if (NS_SUCCEEDED(mFileStatus) && mFile->IsWriteInProgress()) {
+    // The file is used when there are open streams or chunks/metadata still
+    // waiting for write.  In this case, this entry cannot be purged,
+    // otherwise reopenned entry would may not even find the data on disk -
+    // CacheFile is not shared and cannot be left orphan when its job is not
+    // done, hence keep the whole entry.
+    LOG(("  file still under use"));
+    return false;
+  }
+
+  switch (aWhat) {
+    case PURGE_WHOLE_ONLY_DISK_BACKED:
+    case PURGE_WHOLE: {
+      if (!CacheStorageService::Self()->RemoveEntry(this, true)) {
+        LOG(("  not purging, still referenced"));
+        return false;
+      }
+
+      CacheStorageService::Self()->UnregisterEntry(this);
+
+      // Entry removed it self from control arrays, return true
+      return true;
+    }
+
+    case PURGE_DATA_ONLY_DISK_BACKED: {
+      NS_ENSURE_SUCCESS(mFileStatus, false);
+
+      mFile->ThrowMemoryCachedData();
+
+      // Entry has been left in control arrays, return false (not purged)
+      return false;
+    }
+  }
+
+  LOG(("  ?"));
+  return false;
+}
+
+void CacheEntry::PurgeAndDoom() {
+  LOG(("CacheEntry::PurgeAndDoom [this=%p]", this));
+
+  CacheStorageService::Self()->RemoveEntry(this);
+  DoomAlreadyRemoved();
+}
+
+void CacheEntry::DoomAlreadyRemoved() {
+  LOG(("CacheEntry::DoomAlreadyRemoved [this=%p]", this));
+
+  mozilla::MutexAutoLock lock(mLock);
+
+  RemoveForcedValidity();
+
+  mIsDoomed = true;
+
+  // Pretend pinning is know.  This entry is now doomed for good, so don't
+  // bother with defering doom because of unknown pinning state any more.
+  mPinningKnown = true;
+
+  // This schedules dooming of the file, dooming is ensured to happen
+  // sooner than demand to open the same file made after this point
+  // so that we don't get this file for any newer opened entry(s).
+  DoomFile();
+
+  // Must force post here since may be indirectly called from
+  // InvokeCallbacks of this entry and we don't want reentrancy here.
+  BackgroundOp(Ops::CALLBACKS, true);
+  // Process immediately when on the management thread.
+  BackgroundOp(Ops::UNREGISTER);
+}
+
+void CacheEntry::DoomFile() {
+  nsresult rv = NS_ERROR_NOT_AVAILABLE;
+
+  if (NS_SUCCEEDED(mFileStatus)) {
+    if (mHandlesCount == 0 || (mHandlesCount == 1 && mWriter)) {
+      // We kill the file also when there is just reference from the writer,
+      // no one else could ever reach the written data.  Obvisouly also
+      // when there is no reference at all (should we ever end up here
+      // in that case.)
+      // Tell the file to kill the handle, i.e. bypass any I/O operations
+      // on it except removing the file.
+      mFile->Kill();
+    }
+
+    // Always calls the callback asynchronously.
+    rv = mFile->Doom(mDoomCallback ? this : nullptr);
+    if (NS_SUCCEEDED(rv)) {
+      LOG(("  file doomed"));
+      return;
+    }
+
+    if (NS_ERROR_FILE_NOT_FOUND == rv) {
+      // File is set to be just memory-only, notify the callbacks
+      // and pretend dooming has succeeded.  From point of view of
+      // the entry it actually did - the data is gone and cannot be
+      // reused.
+      rv = NS_OK;
+    }
+  }
+
+  // Always posts to the main thread.
+  OnFileDoomed(rv);
+}
+
+void CacheEntry::RemoveForcedValidity() {
+  mLock.AssertCurrentThreadOwns();
+
+  nsresult rv;
+
+  if (mIsDoomed) {
+    return;
+  }
+
+  nsAutoCString entryKey;
+  rv = HashingKey(entryKey);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  CacheStorageService::Self()->RemoveEntryForceValid(mStorageID, entryKey);
+}
+
+void CacheEntry::BackgroundOp(uint32_t aOperations, bool aForceAsync) {
+  mLock.AssertCurrentThreadOwns();
+
+  if (!CacheStorageService::IsOnManagementThread() || aForceAsync) {
+    if (mBackgroundOperations.Set(aOperations)) {
+      CacheStorageService::Self()->Dispatch(this);
+    }
+
+    LOG(("CacheEntry::BackgroundOp this=%p dipatch of %x", this, aOperations));
+    return;
+  }
+
+  {
+    mozilla::MutexAutoUnlock unlock(mLock);
+
+    MOZ_ASSERT(CacheStorageService::IsOnManagementThread());
+
+    if (aOperations & Ops::FRECENCYUPDATE) {
+      ++mUseCount;
+
+#ifndef M_LN2
+#  define M_LN2 0.69314718055994530942
+#endif
+
+      // Half-life is dynamic, in seconds.
+      static double half_life = CacheObserver::HalfLifeSeconds();
+      // Must convert from seconds to milliseconds since PR_Now() gives usecs.
+      static double const decay =
+          (M_LN2 / half_life) / static_cast<double>(PR_USEC_PER_SEC);
+
+      double now_decay = static_cast<double>(PR_Now()) * decay;
+
+      if (mFrecency == 0) {
+        mFrecency = now_decay;
+      } else {
+        // TODO: when C++11 enabled, use std::log1p(n) which is equal to log(n +
+        // 1) but more precise.
+        mFrecency = log(exp(mFrecency - now_decay) + 1) + now_decay;
+      }
+      LOG(("CacheEntry FRECENCYUPDATE [this=%p, frecency=%1.10f]", this,
+           mFrecency));
+
+      // Because CacheFile::Set*() are not thread-safe to use (uses
+      // WeakReference that is not thread-safe) we must post to the main
+      // thread...
+      NS_DispatchToMainThread(
+          NewRunnableMethod<double>("net::CacheEntry::StoreFrecency", this,
+                                    &CacheEntry::StoreFrecency, mFrecency));
+    }
+
+    if (aOperations & Ops::REGISTER) {
+      LOG(("CacheEntry REGISTER [this=%p]", this));
+
+      CacheStorageService::Self()->RegisterEntry(this);
+    }
+
+    if (aOperations & Ops::UNREGISTER) {
+      LOG(("CacheEntry UNREGISTER [this=%p]", this));
+
+      CacheStorageService::Self()->UnregisterEntry(this);
+    }
+  }  // unlock
+
+  if (aOperations & Ops::CALLBACKS) {
+    LOG(("CacheEntry CALLBACKS (invoke) [this=%p]", this));
+
+    InvokeCallbacks();
+  }
+}
+
+void CacheEntry::StoreFrecency(double aFrecency) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (NS_SUCCEEDED(mFileStatus)) {
+    mFile->SetFrecency(FRECENCY2INT(aFrecency));
+  }
+}
+
+// CacheOutputCloseListener
+
+CacheOutputCloseListener::CacheOutputCloseListener(CacheEntry* aEntry)
+    : Runnable("net::CacheOutputCloseListener"), mEntry(aEntry) {}
+
+void CacheOutputCloseListener::OnOutputClosed() {
+  // We need this class and to redispatch since this callback is invoked
+  // under the file's lock and to do the job we need to enter the entry's
+  // lock too.  That would lead to potential deadlocks.
+  // This function may be reached while XPCOM is already shutting down,
+  // and we might be unable to obtain the main thread or the sts. #1826661
+
+  if (NS_IsMainThread()) {
+    // If we're already on the main thread, dispatch to the main thread instead
+    // of the sts. Always dispatching to the sts can cause problems late in
+    // shutdown, when threadpools may no longer be available (bug 1806332).
+    //
+    // This may also avoid some unnecessary thread-hops when invoking callbacks,
+    // which can require that they be called on the main thread.
+
+    nsCOMPtr<nsIThread> thread;
+    nsresult rv = NS_GetMainThread(getter_AddRefs(thread));
+    if (NS_SUCCEEDED(rv)) {
+      MOZ_ALWAYS_SUCCEEDS(thread->Dispatch(do_AddRef(this)));
+    }
+    return;
+  }
+
+  nsCOMPtr<nsIEventTarget> sts =
+      do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
+  MOZ_DIAGNOSTIC_ASSERT(sts);
+  if (sts) {
+    MOZ_ALWAYS_SUCCEEDS(sts->Dispatch(do_AddRef(this)));
+  }
+}
+
+NS_IMETHODIMP CacheOutputCloseListener::Run() {
+  mEntry->OnOutputClosed();
+  return NS_OK;
+}
+
+// Memory reporting
+
+size_t CacheEntry::SizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) {
+  size_t n = 0;
+
+  MutexAutoLock lock(mLock);
+  n += mCallbacks.ShallowSizeOfExcludingThis(mallocSizeOf);
+  if (mFile) {
+    n += mFile->SizeOfIncludingThis(mallocSizeOf);
+  }
+
+  n += mURI.SizeOfExcludingThisIfUnshared(mallocSizeOf);
+  n += mEnhanceID.SizeOfExcludingThisIfUnshared(mallocSizeOf);
+  n += mStorageID.SizeOfExcludingThisIfUnshared(mallocSizeOf);
+
+  // mDoomCallback is an arbitrary class that is probably reported elsewhere.
+  // mOutputStream is reported in mFile.
+  // mWriter is one of many handles we create, but (intentionally) not keep
+  // any reference to, so those unfortunately cannot be reported.  Handles are
+  // small, though.
+  // mSecurityInfo doesn't impl nsISizeOf.
+
+  return n;
+}
+
+size_t CacheEntry::SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) {
+  return mallocSizeOf(this) + SizeOfExcludingThis(mallocSizeOf);
+}
+
+}  // namespace mozilla::net