Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

1 files changed, 2589 insertions, 0 deletions

diff --git a/netwerk/cache2/CacheFile.cpp b/netwerk/cache2/CacheFile.cpp
new file mode 100644
index 0000000000..02a9f3bce7
--- /dev/null
+++ b/netwerk/cache2/CacheFile.cpp
@@ -0,0 +1,2589 @@
+/* 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 "CacheFile.h"
+
+#include <algorithm>
+#include <utility>
+
+#include "CacheFileChunk.h"
+#include "CacheFileInputStream.h"
+#include "CacheFileOutputStream.h"
+#include "CacheFileUtils.h"
+#include "CacheIndex.h"
+#include "CacheLog.h"
+#include "mozilla/DebugOnly.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/TelemetryHistogramEnums.h"
+#include "nsComponentManagerUtils.h"
+#include "nsICacheEntry.h"
+#include "nsProxyRelease.h"
+#include "nsThreadUtils.h"
+
+// When CACHE_CHUNKS is defined we always cache unused chunks in mCacheChunks.
+// When it is not defined, we always release the chunks ASAP, i.e. we cache
+// unused chunks only when:
+//  - CacheFile is memory-only
+//  - CacheFile is still waiting for the handle
+//  - the chunk is preloaded
+
+// #define CACHE_CHUNKS
+
+namespace mozilla::net {
+
+using CacheFileUtils::CacheFileLock;
+
+class NotifyCacheFileListenerEvent : public Runnable {
+ public:
+  NotifyCacheFileListenerEvent(CacheFileListener* aCallback, nsresult aResult,
+                               bool aIsNew)
+      : Runnable("net::NotifyCacheFileListenerEvent"),
+        mCallback(aCallback),
+        mRV(aResult),
+        mIsNew(aIsNew) {
+    LOG(
+        ("NotifyCacheFileListenerEvent::NotifyCacheFileListenerEvent() "
+         "[this=%p]",
+         this));
+  }
+
+ protected:
+  ~NotifyCacheFileListenerEvent() {
+    LOG(
+        ("NotifyCacheFileListenerEvent::~NotifyCacheFileListenerEvent() "
+         "[this=%p]",
+         this));
+  }
+
+ public:
+  NS_IMETHOD Run() override {
+    LOG(("NotifyCacheFileListenerEvent::Run() [this=%p]", this));
+
+    mCallback->OnFileReady(mRV, mIsNew);
+    return NS_OK;
+  }
+
+ protected:
+  nsCOMPtr<CacheFileListener> mCallback;
+  nsresult mRV;
+  bool mIsNew;
+};
+
+class NotifyChunkListenerEvent : public Runnable {
+ public:
+  NotifyChunkListenerEvent(CacheFileChunkListener* aCallback, nsresult aResult,
+                           uint32_t aChunkIdx, CacheFileChunk* aChunk)
+      : Runnable("net::NotifyChunkListenerEvent"),
+        mCallback(aCallback),
+        mRV(aResult),
+        mChunkIdx(aChunkIdx),
+        mChunk(aChunk) {
+    LOG(("NotifyChunkListenerEvent::NotifyChunkListenerEvent() [this=%p]",
+         this));
+  }
+
+ protected:
+  ~NotifyChunkListenerEvent() {
+    LOG(("NotifyChunkListenerEvent::~NotifyChunkListenerEvent() [this=%p]",
+         this));
+  }
+
+ public:
+  NS_IMETHOD Run() override {
+    LOG(("NotifyChunkListenerEvent::Run() [this=%p]", this));
+
+    mCallback->OnChunkAvailable(mRV, mChunkIdx, mChunk);
+    return NS_OK;
+  }
+
+ protected:
+  nsCOMPtr<CacheFileChunkListener> mCallback;
+  nsresult mRV;
+  uint32_t mChunkIdx;
+  RefPtr<CacheFileChunk> mChunk;
+};
+
+class DoomFileHelper : public CacheFileIOListener {
+ public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+
+  explicit DoomFileHelper(CacheFileListener* aListener)
+      : mListener(aListener) {}
+
+  NS_IMETHOD OnFileOpened(CacheFileHandle* aHandle, nsresult aResult) override {
+    MOZ_CRASH("DoomFileHelper::OnFileOpened should not be called!");
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  NS_IMETHOD OnDataWritten(CacheFileHandle* aHandle, const char* aBuf,
+                           nsresult aResult) override {
+    MOZ_CRASH("DoomFileHelper::OnDataWritten should not be called!");
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  NS_IMETHOD OnDataRead(CacheFileHandle* aHandle, char* aBuf,
+                        nsresult aResult) override {
+    MOZ_CRASH("DoomFileHelper::OnDataRead should not be called!");
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  NS_IMETHOD OnFileDoomed(CacheFileHandle* aHandle, nsresult aResult) override {
+    if (mListener) mListener->OnFileDoomed(aResult);
+    return NS_OK;
+  }
+
+  NS_IMETHOD OnEOFSet(CacheFileHandle* aHandle, nsresult aResult) override {
+    MOZ_CRASH("DoomFileHelper::OnEOFSet should not be called!");
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  NS_IMETHOD OnFileRenamed(CacheFileHandle* aHandle,
+                           nsresult aResult) override {
+    MOZ_CRASH("DoomFileHelper::OnFileRenamed should not be called!");
+    return NS_ERROR_UNEXPECTED;
+  }
+
+ private:
+  virtual ~DoomFileHelper() = default;
+
+  nsCOMPtr<CacheFileListener> mListener;
+};
+
+NS_IMPL_ISUPPORTS(DoomFileHelper, CacheFileIOListener)
+
+NS_IMPL_ADDREF(CacheFile)
+NS_IMPL_RELEASE(CacheFile)
+NS_INTERFACE_MAP_BEGIN(CacheFile)
+  NS_INTERFACE_MAP_ENTRY(mozilla::net::CacheFileChunkListener)
+  NS_INTERFACE_MAP_ENTRY(mozilla::net::CacheFileIOListener)
+  NS_INTERFACE_MAP_ENTRY(mozilla::net::CacheFileMetadataListener)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports,
+                                   mozilla::net::CacheFileChunkListener)
+NS_INTERFACE_MAP_END
+
+CacheFile::CacheFile() : mLock(new CacheFileLock()) {
+  LOG(("CacheFile::CacheFile() [this=%p]", this));
+}
+
+CacheFile::~CacheFile() {
+  LOG(("CacheFile::~CacheFile() [this=%p]", this));
+
+  MutexAutoLock lock(mLock->Lock());
+  if (!mMemoryOnly && mReady && !mKill) {
+    // mReady flag indicates we have metadata plus in a valid state.
+    WriteMetadataIfNeededLocked(true);
+  }
+}
+
+nsresult CacheFile::Init(const nsACString& aKey, bool aCreateNew,
+                         bool aMemoryOnly, bool aSkipSizeCheck, bool aPriority,
+                         bool aPinned, CacheFileListener* aCallback)
+    MOZ_NO_THREAD_SAFETY_ANALYSIS {
+  MOZ_ASSERT(!mListener);
+  MOZ_ASSERT(!mHandle);
+
+  MOZ_ASSERT(!(aMemoryOnly && aPinned));
+
+  nsresult rv;
+
+  mKey = aKey;
+  mOpenAsMemoryOnly = mMemoryOnly = aMemoryOnly;
+  mSkipSizeCheck = aSkipSizeCheck;
+  mPriority = aPriority;
+  mPinned = aPinned;
+
+  // Some consumers (at least nsHTTPCompressConv) assume that Read() can read
+  // such amount of data that was announced by Available().
+  // CacheFileInputStream::Available() uses also preloaded chunks to compute
+  // number of available bytes in the input stream, so we have to make sure the
+  // preloadChunkCount won't change during CacheFile's lifetime since otherwise
+  // we could potentially release some cached chunks that was used to calculate
+  // available bytes but would not be available later during call to
+  // CacheFileInputStream::Read().
+  mPreloadChunkCount = CacheObserver::PreloadChunkCount();
+
+  LOG(
+      ("CacheFile::Init() [this=%p, key=%s, createNew=%d, memoryOnly=%d, "
+       "priority=%d, listener=%p]",
+       this, mKey.get(), aCreateNew, aMemoryOnly, aPriority, aCallback));
+
+  if (mMemoryOnly) {
+    MOZ_ASSERT(!aCallback);
+
+    mMetadata = new CacheFileMetadata(mOpenAsMemoryOnly, false, mKey,
+                                      WrapNotNull(mLock));
+    mReady = true;
+    mDataSize = mMetadata->Offset();
+    return NS_OK;
+  }
+  uint32_t flags;
+  if (aCreateNew) {
+    MOZ_ASSERT(!aCallback);
+    flags = CacheFileIOManager::CREATE_NEW;
+
+    // make sure we can use this entry immediately
+    mMetadata = new CacheFileMetadata(mOpenAsMemoryOnly, mPinned, mKey,
+                                      WrapNotNull(mLock));
+    mReady = true;
+    mDataSize = mMetadata->Offset();
+  } else {
+    flags = CacheFileIOManager::CREATE;
+  }
+
+  if (mPriority) {
+    flags |= CacheFileIOManager::PRIORITY;
+  }
+
+  if (mPinned) {
+    flags |= CacheFileIOManager::PINNED;
+  }
+
+  mOpeningFile = true;
+  mListener = aCallback;
+  rv = CacheFileIOManager::OpenFile(mKey, flags, this);
+  if (NS_FAILED(rv)) {
+    mListener = nullptr;
+    mOpeningFile = false;
+
+    if (mPinned) {
+      LOG(
+          ("CacheFile::Init() - CacheFileIOManager::OpenFile() failed "
+           "but we want to pin, fail the file opening. [this=%p]",
+           this));
+      return NS_ERROR_NOT_AVAILABLE;
+    }
+
+    if (aCreateNew) {
+      NS_WARNING("Forcing memory-only entry since OpenFile failed");
+      LOG(
+          ("CacheFile::Init() - CacheFileIOManager::OpenFile() failed "
+           "synchronously. We can continue in memory-only mode since "
+           "aCreateNew == true. [this=%p]",
+           this));
+
+      mMemoryOnly = true;
+    } else if (rv == NS_ERROR_NOT_INITIALIZED) {
+      NS_WARNING(
+          "Forcing memory-only entry since CacheIOManager isn't "
+          "initialized.");
+      LOG(
+          ("CacheFile::Init() - CacheFileIOManager isn't initialized, "
+           "initializing entry as memory-only. [this=%p]",
+           this));
+
+      mMemoryOnly = true;
+      mMetadata = new CacheFileMetadata(mOpenAsMemoryOnly, mPinned, mKey,
+                                        WrapNotNull(mLock));
+      mReady = true;
+      mDataSize = mMetadata->Offset();
+
+      RefPtr<NotifyCacheFileListenerEvent> ev;
+      ev = new NotifyCacheFileListenerEvent(aCallback, NS_OK, true);
+      rv = NS_DispatchToCurrentThread(ev);
+      NS_ENSURE_SUCCESS(rv, rv);
+    } else {
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+  }
+
+  return NS_OK;
+}
+
+void CacheFile::Key(nsACString& aKey) {
+  CacheFileAutoLock lock(this);
+  aKey = mKey;
+}
+
+bool CacheFile::IsPinned() {
+  CacheFileAutoLock lock(this);
+  return mPinned;
+}
+
+nsresult CacheFile::OnChunkRead(nsresult aResult, CacheFileChunk* aChunk) {
+  CacheFileAutoLock lock(this);
+
+  nsresult rv;
+
+  uint32_t index = aChunk->Index();
+
+  LOG(("CacheFile::OnChunkRead() [this=%p, rv=0x%08" PRIx32
+       ", chunk=%p, idx=%u]",
+       this, static_cast<uint32_t>(aResult), aChunk, index));
+
+  if (aChunk->mDiscardedChunk) {
+    // We discard only unused chunks, so it must be still unused when reading
+    // data finishes.
+    MOZ_ASSERT(aChunk->mRefCnt == 2);
+    aChunk->mActiveChunk = false;
+    ReleaseOutsideLock(
+        RefPtr<CacheFileChunkListener>(std::move(aChunk->mFile)));
+
+    DebugOnly<bool> removed = mDiscardedChunks.RemoveElement(aChunk);
+    MOZ_ASSERT(removed);
+    return NS_OK;
+  }
+
+  if (NS_FAILED(aResult)) {
+    SetError(aResult);
+  }
+
+  if (HaveChunkListeners(index)) {
+    rv = NotifyChunkListeners(index, aResult, aChunk);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  return NS_OK;
+}
+
+nsresult CacheFile::OnChunkWritten(nsresult aResult, CacheFileChunk* aChunk) {
+  // In case the chunk was reused, made dirty and released between calls to
+  // CacheFileChunk::Write() and CacheFile::OnChunkWritten(), we must write
+  // the chunk to the disk again. When the chunk is unused and is dirty simply
+  // addref and release (outside the lock) the chunk which ensures that
+  // CacheFile::DeactivateChunk() will be called again.
+  RefPtr<CacheFileChunk> deactivateChunkAgain;
+
+  CacheFileAutoLock lock(this);
+
+  nsresult rv;
+
+  LOG(("CacheFile::OnChunkWritten() [this=%p, rv=0x%08" PRIx32
+       ", chunk=%p, idx=%u]",
+       this, static_cast<uint32_t>(aResult), aChunk, aChunk->Index()));
+
+  MOZ_ASSERT(!mMemoryOnly);
+  MOZ_ASSERT(!mOpeningFile);
+  MOZ_ASSERT(mHandle);
+
+  if (aChunk->mDiscardedChunk) {
+    // We discard only unused chunks, so it must be still unused when writing
+    // data finishes.
+    MOZ_ASSERT(aChunk->mRefCnt == 2);
+    aChunk->mActiveChunk = false;
+    ReleaseOutsideLock(
+        RefPtr<CacheFileChunkListener>(std::move(aChunk->mFile)));
+
+    DebugOnly<bool> removed = mDiscardedChunks.RemoveElement(aChunk);
+    MOZ_ASSERT(removed);
+    return NS_OK;
+  }
+
+  if (NS_FAILED(aResult)) {
+    SetError(aResult);
+  }
+
+  if (NS_SUCCEEDED(aResult) && !aChunk->IsDirty()) {
+    // update hash value in metadata
+    mMetadata->SetHash(aChunk->Index(), aChunk->Hash());
+  }
+
+  // notify listeners if there is any
+  if (HaveChunkListeners(aChunk->Index())) {
+    // don't release the chunk since there are some listeners queued
+    rv = NotifyChunkListeners(aChunk->Index(), aResult, aChunk);
+    if (NS_SUCCEEDED(rv)) {
+      MOZ_ASSERT(aChunk->mRefCnt != 2);
+      return NS_OK;
+    }
+  }
+
+  if (aChunk->mRefCnt != 2) {
+    LOG(
+        ("CacheFile::OnChunkWritten() - Chunk is still used [this=%p, chunk=%p,"
+         " refcnt=%" PRIuPTR "]",
+         this, aChunk, aChunk->mRefCnt.get()));
+
+    return NS_OK;
+  }
+
+  if (aChunk->IsDirty()) {
+    LOG(
+        ("CacheFile::OnChunkWritten() - Unused chunk is dirty. We must go "
+         "through deactivation again. [this=%p, chunk=%p]",
+         this, aChunk));
+
+    deactivateChunkAgain = aChunk;
+    return NS_OK;
+  }
+
+  bool keepChunk = false;
+  if (NS_SUCCEEDED(aResult)) {
+    keepChunk = ShouldCacheChunk(aChunk->Index());
+    LOG(("CacheFile::OnChunkWritten() - %s unused chunk [this=%p, chunk=%p]",
+         keepChunk ? "Caching" : "Releasing", this, aChunk));
+  } else {
+    LOG(
+        ("CacheFile::OnChunkWritten() - Releasing failed chunk [this=%p, "
+         "chunk=%p]",
+         this, aChunk));
+  }
+
+  RemoveChunkInternal(aChunk, keepChunk);
+
+  WriteMetadataIfNeededLocked();
+
+  return NS_OK;
+}
+
+nsresult CacheFile::OnChunkAvailable(nsresult aResult, uint32_t aChunkIdx,
+                                     CacheFileChunk* aChunk) {
+  MOZ_CRASH("CacheFile::OnChunkAvailable should not be called!");
+  return NS_ERROR_UNEXPECTED;
+}
+
+nsresult CacheFile::OnChunkUpdated(CacheFileChunk* aChunk) {
+  MOZ_CRASH("CacheFile::OnChunkUpdated should not be called!");
+  return NS_ERROR_UNEXPECTED;
+}
+
+nsresult CacheFile::OnFileOpened(CacheFileHandle* aHandle, nsresult aResult) {
+  // Using an 'auto' class to perform doom or fail the listener
+  // outside the CacheFile's lock.
+  class AutoFailDoomListener {
+   public:
+    explicit AutoFailDoomListener(CacheFileHandle* aHandle)
+        : mHandle(aHandle), mAlreadyDoomed(false) {}
+    ~AutoFailDoomListener() {
+      if (!mListener) return;
+
+      if (mHandle) {
+        if (mAlreadyDoomed) {
+          mListener->OnFileDoomed(mHandle, NS_OK);
+        } else {
+          CacheFileIOManager::DoomFile(mHandle, mListener);
+        }
+      } else {
+        mListener->OnFileDoomed(nullptr, NS_ERROR_NOT_AVAILABLE);
+      }
+    }
+
+    CacheFileHandle* mHandle;
+    nsCOMPtr<CacheFileIOListener> mListener;
+    bool mAlreadyDoomed;
+  } autoDoom(aHandle);
+
+  RefPtr<CacheFileMetadata> metadata;
+  nsCOMPtr<CacheFileListener> listener;
+  bool isNew = false;
+  nsresult retval = NS_OK;
+
+  {
+    CacheFileAutoLock lock(this);
+
+    MOZ_ASSERT(mOpeningFile);
+    MOZ_ASSERT((NS_SUCCEEDED(aResult) && aHandle) ||
+               (NS_FAILED(aResult) && !aHandle));
+    MOZ_ASSERT((mListener && !mMetadata) ||  // !createNew
+               (!mListener && mMetadata));   // createNew
+    MOZ_ASSERT(!mMemoryOnly || mMetadata);   // memory-only was set on new entry
+
+    LOG(("CacheFile::OnFileOpened() [this=%p, rv=0x%08" PRIx32 ", handle=%p]",
+         this, static_cast<uint32_t>(aResult), aHandle));
+
+    mOpeningFile = false;
+
+    autoDoom.mListener.swap(mDoomAfterOpenListener);
+
+    if (mMemoryOnly) {
+      // We can be here only in case the entry was initilized as createNew and
+      // SetMemoryOnly() was called.
+
+      // Just don't store the handle into mHandle and exit
+      autoDoom.mAlreadyDoomed = true;
+      return NS_OK;
+    }
+
+    if (NS_FAILED(aResult)) {
+      if (mMetadata) {
+        // This entry was initialized as createNew, just switch to memory-only
+        // mode.
+        NS_WARNING("Forcing memory-only entry since OpenFile failed");
+        LOG(
+            ("CacheFile::OnFileOpened() - CacheFileIOManager::OpenFile() "
+             "failed asynchronously. We can continue in memory-only mode since "
+             "aCreateNew == true. [this=%p]",
+             this));
+
+        mMemoryOnly = true;
+        return NS_OK;
+      }
+
+      if (aResult == NS_ERROR_FILE_INVALID_PATH) {
+        // CacheFileIOManager doesn't have mCacheDirectory, switch to
+        // memory-only mode.
+        NS_WARNING(
+            "Forcing memory-only entry since CacheFileIOManager doesn't "
+            "have mCacheDirectory.");
+        LOG(
+            ("CacheFile::OnFileOpened() - CacheFileIOManager doesn't have "
+             "mCacheDirectory, initializing entry as memory-only. [this=%p]",
+             this));
+
+        mMemoryOnly = true;
+        mMetadata = new CacheFileMetadata(mOpenAsMemoryOnly, mPinned, mKey,
+                                          WrapNotNull(mLock));
+        mReady = true;
+        mDataSize = mMetadata->Offset();
+
+        isNew = true;
+        retval = NS_OK;
+      } else {
+        // CacheFileIOManager::OpenFile() failed for another reason.
+        isNew = false;
+        retval = aResult;
+      }
+
+      mListener.swap(listener);
+    } else {
+      mHandle = aHandle;
+      if (NS_FAILED(mStatus)) {
+        CacheFileIOManager::DoomFile(mHandle, nullptr);
+      }
+
+      if (mMetadata) {
+        InitIndexEntry();
+
+        // The entry was initialized as createNew, don't try to read metadata.
+        mMetadata->SetHandle(mHandle);
+
+        // Write all cached chunks, otherwise they may stay unwritten.
+        for (auto iter = mCachedChunks.Iter(); !iter.Done(); iter.Next()) {
+          uint32_t idx = iter.Key();
+          RefPtr<CacheFileChunk>& chunk = iter.Data();
+
+          LOG(("CacheFile::OnFileOpened() - write [this=%p, idx=%u, chunk=%p]",
+               this, idx, chunk.get()));
+
+          mChunks.InsertOrUpdate(idx, RefPtr{chunk});
+          chunk->mFile = this;
+          chunk->mActiveChunk = true;
+
+          MOZ_ASSERT(chunk->IsReady());
+
+          // This would be cleaner if we had an nsRefPtr constructor that took
+          // a RefPtr<Derived>.
+          ReleaseOutsideLock(std::move(chunk));
+
+          iter.Remove();
+        }
+
+        return NS_OK;
+      }
+    }
+    if (listener) {
+      lock.Unlock();
+      listener->OnFileReady(retval, isNew);
+      return NS_OK;
+    }
+
+    MOZ_ASSERT(NS_SUCCEEDED(aResult));
+    MOZ_ASSERT(!mMetadata);
+    MOZ_ASSERT(mListener);
+
+    // mMetaData is protected by a lock, but ReadMetaData has to be called
+    // without the lock.  Alternatively we could make a
+    // "ReadMetaDataLocked", and temporarily unlock to call OnFileReady
+    metadata = mMetadata =
+        new CacheFileMetadata(mHandle, mKey, WrapNotNull(mLock));
+  }
+  metadata->ReadMetadata(this);
+  return NS_OK;
+}
+
+nsresult CacheFile::OnDataWritten(CacheFileHandle* aHandle, const char* aBuf,
+                                  nsresult aResult) {
+  MOZ_CRASH("CacheFile::OnDataWritten should not be called!");
+  return NS_ERROR_UNEXPECTED;
+}
+
+nsresult CacheFile::OnDataRead(CacheFileHandle* aHandle, char* aBuf,
+                               nsresult aResult) {
+  MOZ_CRASH("CacheFile::OnDataRead should not be called!");
+  return NS_ERROR_UNEXPECTED;
+}
+
+nsresult CacheFile::OnMetadataRead(nsresult aResult) {
+  nsCOMPtr<CacheFileListener> listener;
+  bool isNew = false;
+  {
+    CacheFileAutoLock lock(this);
+    MOZ_ASSERT(mListener);
+
+    LOG(("CacheFile::OnMetadataRead() [this=%p, rv=0x%08" PRIx32 "]", this,
+         static_cast<uint32_t>(aResult)));
+
+    if (NS_SUCCEEDED(aResult)) {
+      mPinned = mMetadata->Pinned();
+      mReady = true;
+      mDataSize = mMetadata->Offset();
+      if (mDataSize == 0 && mMetadata->ElementsSize() == 0) {
+        isNew = true;
+        mMetadata->MarkDirty();
+      } else {
+        const char* altData =
+            mMetadata->GetElement(CacheFileUtils::kAltDataKey);
+        if (altData && (NS_FAILED(CacheFileUtils::ParseAlternativeDataInfo(
+                            altData, &mAltDataOffset, &mAltDataType)) ||
+                        (mAltDataOffset > mDataSize))) {
+          // alt-metadata cannot be parsed or alt-data offset is invalid
+          mMetadata->InitEmptyMetadata();
+          isNew = true;
+          mAltDataOffset = -1;
+          mAltDataType.Truncate();
+          mDataSize = 0;
+        } else {
+          PreloadChunks(0);
+        }
+      }
+
+      InitIndexEntry();
+    }
+
+    mListener.swap(listener);
+  }
+  listener->OnFileReady(aResult, isNew);
+  return NS_OK;
+}
+
+nsresult CacheFile::OnMetadataWritten(nsresult aResult) {
+  CacheFileAutoLock lock(this);
+
+  LOG(("CacheFile::OnMetadataWritten() [this=%p, rv=0x%08" PRIx32 "]", this,
+       static_cast<uint32_t>(aResult)));
+
+  MOZ_ASSERT(mWritingMetadata);
+  mWritingMetadata = false;
+
+  MOZ_ASSERT(!mMemoryOnly);
+  MOZ_ASSERT(!mOpeningFile);
+
+  if (NS_WARN_IF(NS_FAILED(aResult))) {
+    // TODO close streams with an error ???
+    SetError(aResult);
+  }
+
+  if (mOutput || mInputs.Length() || mChunks.Count()) return NS_OK;
+
+  if (IsDirty()) WriteMetadataIfNeededLocked();
+
+  if (!mWritingMetadata) {
+    LOG(("CacheFile::OnMetadataWritten() - Releasing file handle [this=%p]",
+         this));
+    CacheFileIOManager::ReleaseNSPRHandle(mHandle);
+  }
+
+  return NS_OK;
+}
+
+nsresult CacheFile::OnFileDoomed(CacheFileHandle* aHandle, nsresult aResult) {
+  nsCOMPtr<CacheFileListener> listener;
+
+  {
+    CacheFileAutoLock lock(this);
+
+    MOZ_ASSERT(mListener);
+
+    LOG(("CacheFile::OnFileDoomed() [this=%p, rv=0x%08" PRIx32 ", handle=%p]",
+         this, static_cast<uint32_t>(aResult), aHandle));
+
+    mListener.swap(listener);
+  }
+
+  listener->OnFileDoomed(aResult);
+  return NS_OK;
+}
+
+nsresult CacheFile::OnEOFSet(CacheFileHandle* aHandle, nsresult aResult) {
+  MOZ_CRASH("CacheFile::OnEOFSet should not be called!");
+  return NS_ERROR_UNEXPECTED;
+}
+
+nsresult CacheFile::OnFileRenamed(CacheFileHandle* aHandle, nsresult aResult) {
+  MOZ_CRASH("CacheFile::OnFileRenamed should not be called!");
+  return NS_ERROR_UNEXPECTED;
+}
+
+bool CacheFile::IsKilled() {
+  bool killed = mKill;
+  if (killed) {
+    LOG(("CacheFile is killed, this=%p", this));
+  }
+
+  return killed;
+}
+
+nsresult CacheFile::OpenInputStream(nsICacheEntry* aEntryHandle,
+                                    nsIInputStream** _retval) {
+  CacheFileAutoLock lock(this);
+
+  MOZ_ASSERT(mHandle || mMemoryOnly || mOpeningFile);
+
+  if (!mReady) {
+    LOG(("CacheFile::OpenInputStream() - CacheFile is not ready [this=%p]",
+         this));
+
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  if (NS_FAILED(mStatus)) {
+    LOG(
+        ("CacheFile::OpenInputStream() - CacheFile is in a failure state "
+         "[this=%p, status=0x%08" PRIx32 "]",
+         this, static_cast<uint32_t>(mStatus)));
+
+    // Don't allow opening the input stream when this CacheFile is in
+    // a failed state.  This is the only way to protect consumers correctly
+    // from reading a broken entry.  When the file is in the failed state,
+    // it's also doomed, so reopening the entry won't make any difference -
+    // data will still be inaccessible anymore.  Note that for just doomed
+    // files, we must allow reading the data.
+    return mStatus;
+  }
+
+  // Once we open input stream we no longer allow preloading of chunks without
+  // input stream, i.e. we will no longer keep first few chunks preloaded when
+  // the last input stream is closed.
+  mPreloadWithoutInputStreams = false;
+
+  CacheFileInputStream* input =
+      new CacheFileInputStream(this, aEntryHandle, false);
+  LOG(("CacheFile::OpenInputStream() - Creating new input stream %p [this=%p]",
+       input, this));
+
+  mInputs.AppendElement(input);
+  NS_ADDREF(input);
+
+  mDataAccessed = true;
+  *_retval = do_AddRef(input).take();
+  return NS_OK;
+}
+
+nsresult CacheFile::OpenAlternativeInputStream(nsICacheEntry* aEntryHandle,
+                                               const char* aAltDataType,
+                                               nsIInputStream** _retval) {
+  CacheFileAutoLock lock(this);
+
+  MOZ_ASSERT(mHandle || mMemoryOnly || mOpeningFile);
+
+  if (NS_WARN_IF(!mReady)) {
+    LOG(
+        ("CacheFile::OpenAlternativeInputStream() - CacheFile is not ready "
+         "[this=%p]",
+         this));
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  if (mAltDataOffset == -1) {
+    LOG(
+        ("CacheFile::OpenAlternativeInputStream() - Alternative data is not "
+         "available [this=%p]",
+         this));
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  if (NS_FAILED(mStatus)) {
+    LOG(
+        ("CacheFile::OpenAlternativeInputStream() - CacheFile is in a failure "
+         "state [this=%p, status=0x%08" PRIx32 "]",
+         this, static_cast<uint32_t>(mStatus)));
+
+    // Don't allow opening the input stream when this CacheFile is in
+    // a failed state.  This is the only way to protect consumers correctly
+    // from reading a broken entry.  When the file is in the failed state,
+    // it's also doomed, so reopening the entry won't make any difference -
+    // data will still be inaccessible anymore.  Note that for just doomed
+    // files, we must allow reading the data.
+    return mStatus;
+  }
+
+  if (mAltDataType != aAltDataType) {
+    LOG(
+        ("CacheFile::OpenAlternativeInputStream() - Alternative data is of a "
+         "different type than requested [this=%p, availableType=%s, "
+         "requestedType=%s]",
+         this, mAltDataType.get(), aAltDataType));
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  // Once we open input stream we no longer allow preloading of chunks without
+  // input stream, i.e. we will no longer keep first few chunks preloaded when
+  // the last input stream is closed.
+  mPreloadWithoutInputStreams = false;
+
+  CacheFileInputStream* input =
+      new CacheFileInputStream(this, aEntryHandle, true);
+
+  LOG(
+      ("CacheFile::OpenAlternativeInputStream() - Creating new input stream %p "
+       "[this=%p]",
+       input, this));
+
+  mInputs.AppendElement(input);
+  NS_ADDREF(input);
+
+  mDataAccessed = true;
+  *_retval = do_AddRef(input).take();
+
+  return NS_OK;
+}
+
+nsresult CacheFile::OpenOutputStream(CacheOutputCloseListener* aCloseListener,
+                                     nsIOutputStream** _retval) {
+  CacheFileAutoLock lock(this);
+
+  MOZ_ASSERT(mHandle || mMemoryOnly || mOpeningFile);
+
+  nsresult rv;
+
+  if (!mReady) {
+    LOG(("CacheFile::OpenOutputStream() - CacheFile is not ready [this=%p]",
+         this));
+
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  if (mOutput) {
+    LOG(
+        ("CacheFile::OpenOutputStream() - We already have output stream %p "
+         "[this=%p]",
+         mOutput, this));
+
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  if (NS_FAILED(mStatus)) {
+    LOG(
+        ("CacheFile::OpenOutputStream() - CacheFile is in a failure state "
+         "[this=%p, status=0x%08" PRIx32 "]",
+         this, static_cast<uint32_t>(mStatus)));
+
+    // The CacheFile is already doomed. It make no sense to allow to write any
+    // data to such entry.
+    return mStatus;
+  }
+
+  // Fail if there is any input stream opened for alternative data
+  for (uint32_t i = 0; i < mInputs.Length(); ++i) {
+    if (mInputs[i]->IsAlternativeData()) {
+      return NS_ERROR_NOT_AVAILABLE;
+    }
+  }
+
+  if (mAltDataOffset != -1) {
+    // Remove alt-data
+    rv = Truncate(mAltDataOffset);
+    if (NS_FAILED(rv)) {
+      LOG(
+          ("CacheFile::OpenOutputStream() - Truncating alt-data failed "
+           "[rv=0x%08" PRIx32 "]",
+           static_cast<uint32_t>(rv)));
+      return rv;
+    }
+    SetAltMetadata(nullptr);
+    mAltDataOffset = -1;
+    mAltDataType.Truncate();
+  }
+
+  // Once we open output stream we no longer allow preloading of chunks without
+  // input stream. There is no reason to believe that some input stream will be
+  // opened soon. Otherwise we would cache unused chunks of all newly created
+  // entries until the CacheFile is destroyed.
+  mPreloadWithoutInputStreams = false;
+
+  mOutput = new CacheFileOutputStream(this, aCloseListener, false);
+
+  LOG(
+      ("CacheFile::OpenOutputStream() - Creating new output stream %p "
+       "[this=%p]",
+       mOutput, this));
+
+  mDataAccessed = true;
+  *_retval = do_AddRef(mOutput).take();
+  return NS_OK;
+}
+
+nsresult CacheFile::OpenAlternativeOutputStream(
+    CacheOutputCloseListener* aCloseListener, const char* aAltDataType,
+    nsIAsyncOutputStream** _retval) {
+  CacheFileAutoLock lock(this);
+
+  MOZ_ASSERT(mHandle || mMemoryOnly || mOpeningFile);
+
+  if (!mReady) {
+    LOG(
+        ("CacheFile::OpenAlternativeOutputStream() - CacheFile is not ready "
+         "[this=%p]",
+         this));
+
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  if (mOutput) {
+    LOG(
+        ("CacheFile::OpenAlternativeOutputStream() - We already have output "
+         "stream %p [this=%p]",
+         mOutput, this));
+
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  if (NS_FAILED(mStatus)) {
+    LOG(
+        ("CacheFile::OpenAlternativeOutputStream() - CacheFile is in a failure "
+         "state [this=%p, status=0x%08" PRIx32 "]",
+         this, static_cast<uint32_t>(mStatus)));
+
+    // The CacheFile is already doomed. It make no sense to allow to write any
+    // data to such entry.
+    return mStatus;
+  }
+
+  // Fail if there is any input stream opened for alternative data
+  for (uint32_t i = 0; i < mInputs.Length(); ++i) {
+    if (mInputs[i]->IsAlternativeData()) {
+      return NS_ERROR_NOT_AVAILABLE;
+    }
+  }
+
+  nsresult rv;
+
+  if (mAltDataOffset != -1) {
+    // Truncate old alt-data
+    rv = Truncate(mAltDataOffset);
+    if (NS_FAILED(rv)) {
+      LOG(
+          ("CacheFile::OpenAlternativeOutputStream() - Truncating old alt-data "
+           "failed [rv=0x%08" PRIx32 "]",
+           static_cast<uint32_t>(rv)));
+      return rv;
+    }
+  } else {
+    mAltDataOffset = mDataSize;
+  }
+
+  nsAutoCString altMetadata;
+  CacheFileUtils::BuildAlternativeDataInfo(aAltDataType, mAltDataOffset,
+                                           altMetadata);
+  rv = SetAltMetadata(altMetadata.get());
+  if (NS_FAILED(rv)) {
+    LOG(
+        ("CacheFile::OpenAlternativeOutputStream() - Set Metadata for alt-data"
+         "failed [rv=0x%08" PRIx32 "]",
+         static_cast<uint32_t>(rv)));
+    return rv;
+  }
+
+  // Once we open output stream we no longer allow preloading of chunks without
+  // input stream. There is no reason to believe that some input stream will be
+  // opened soon. Otherwise we would cache unused chunks of all newly created
+  // entries until the CacheFile is destroyed.
+  mPreloadWithoutInputStreams = false;
+
+  mOutput = new CacheFileOutputStream(this, aCloseListener, true);
+
+  LOG(
+      ("CacheFile::OpenAlternativeOutputStream() - Creating new output stream "
+       "%p [this=%p]",
+       mOutput, this));
+
+  mDataAccessed = true;
+  mAltDataType = aAltDataType;
+  *_retval = do_AddRef(mOutput).take();
+  return NS_OK;
+}
+
+nsresult CacheFile::SetMemoryOnly() {
+  CacheFileAutoLock lock(this);
+
+  LOG(("CacheFile::SetMemoryOnly() mMemoryOnly=%d [this=%p]", mMemoryOnly,
+       this));
+
+  if (mMemoryOnly) return NS_OK;
+
+  MOZ_ASSERT(mReady);
+
+  if (!mReady) {
+    LOG(("CacheFile::SetMemoryOnly() - CacheFile is not ready [this=%p]",
+         this));
+
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  if (mDataAccessed) {
+    LOG(("CacheFile::SetMemoryOnly() - Data was already accessed [this=%p]",
+         this));
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  // TODO what to do when this isn't a new entry and has an existing metadata???
+  mMemoryOnly = true;
+  return NS_OK;
+}
+
+nsresult CacheFile::Doom(CacheFileListener* aCallback) {
+  LOG(("CacheFile::Doom() [this=%p, listener=%p]", this, aCallback));
+
+  CacheFileAutoLock lock(this);
+
+  return DoomLocked(aCallback);
+}
+
+nsresult CacheFile::DoomLocked(CacheFileListener* aCallback) {
+  AssertOwnsLock();
+  MOZ_ASSERT(mHandle || mMemoryOnly || mOpeningFile);
+
+  LOG(("CacheFile::DoomLocked() [this=%p, listener=%p]", this, aCallback));
+
+  nsresult rv = NS_OK;
+
+  if (mMemoryOnly) {
+    return NS_ERROR_FILE_NOT_FOUND;
+  }
+
+  if (mHandle && mHandle->IsDoomed()) {
+    return NS_ERROR_FILE_NOT_FOUND;
+  }
+
+  nsCOMPtr<CacheFileIOListener> listener;
+  if (aCallback || !mHandle) {
+    listener = new DoomFileHelper(aCallback);
+  }
+  if (mHandle) {
+    rv = CacheFileIOManager::DoomFile(mHandle, listener);
+  } else if (mOpeningFile) {
+    mDoomAfterOpenListener = listener;
+  }
+
+  return rv;
+}
+
+nsresult CacheFile::ThrowMemoryCachedData() {
+  CacheFileAutoLock lock(this);
+
+  LOG(("CacheFile::ThrowMemoryCachedData() [this=%p]", this));
+
+  if (mMemoryOnly) {
+    // This method should not be called when the CacheFile was initialized as
+    // memory-only, but it can be called when CacheFile end up as memory-only
+    // due to e.g. IO failure since CacheEntry doesn't know it.
+    LOG(
+        ("CacheFile::ThrowMemoryCachedData() - Ignoring request because the "
+         "entry is memory-only. [this=%p]",
+         this));
+
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  if (mOpeningFile) {
+    // mayhemer, note: we shouldn't get here, since CacheEntry prevents loading
+    // entries from being purged.
+
+    LOG(
+        ("CacheFile::ThrowMemoryCachedData() - Ignoring request because the "
+         "entry is still opening the file [this=%p]",
+         this));
+
+    return NS_ERROR_ABORT;
+  }
+
+  // We cannot release all cached chunks since we need to keep preloaded chunks
+  // in memory. See initialization of mPreloadChunkCount for explanation.
+  CleanUpCachedChunks();
+
+  return NS_OK;
+}
+
+nsresult CacheFile::GetElement(const char* aKey, char** _retval) {
+  CacheFileAutoLock lock(this);
+  MOZ_ASSERT(mMetadata);
+  NS_ENSURE_TRUE(mMetadata, NS_ERROR_UNEXPECTED);
+
+  const char* value;
+  value = mMetadata->GetElement(aKey);
+  if (!value) return NS_ERROR_NOT_AVAILABLE;
+
+  *_retval = NS_xstrdup(value);
+  return NS_OK;
+}
+
+nsresult CacheFile::SetElement(const char* aKey, const char* aValue) {
+  CacheFileAutoLock lock(this);
+
+  LOG(("CacheFile::SetElement() this=%p", this));
+
+  MOZ_ASSERT(mMetadata);
+  NS_ENSURE_TRUE(mMetadata, NS_ERROR_UNEXPECTED);
+
+  if (!strcmp(aKey, CacheFileUtils::kAltDataKey)) {
+    NS_ERROR(
+        "alt-data element is reserved for internal use and must not be "
+        "changed via CacheFile::SetElement()");
+    return NS_ERROR_FAILURE;
+  }
+
+  PostWriteTimer();
+  return mMetadata->SetElement(aKey, aValue);
+}
+
+nsresult CacheFile::VisitMetaData(nsICacheEntryMetaDataVisitor* aVisitor) {
+  CacheFileAutoLock lock(this);
+  MOZ_ASSERT(mMetadata);
+  MOZ_ASSERT(mReady);
+  NS_ENSURE_TRUE(mMetadata, NS_ERROR_UNEXPECTED);
+
+  mMetadata->Visit(aVisitor);
+  return NS_OK;
+}
+
+nsresult CacheFile::ElementsSize(uint32_t* _retval) {
+  CacheFileAutoLock lock(this);
+
+  if (!mMetadata) return NS_ERROR_NOT_AVAILABLE;
+
+  *_retval = mMetadata->ElementsSize();
+  return NS_OK;
+}
+
+nsresult CacheFile::SetExpirationTime(uint32_t aExpirationTime) {
+  CacheFileAutoLock lock(this);
+
+  LOG(("CacheFile::SetExpirationTime() this=%p, expiration=%u", this,
+       aExpirationTime));
+
+  MOZ_ASSERT(mMetadata);
+  NS_ENSURE_TRUE(mMetadata, NS_ERROR_UNEXPECTED);
+
+  PostWriteTimer();
+  mMetadata->SetExpirationTime(aExpirationTime);
+  return NS_OK;
+}
+
+nsresult CacheFile::GetExpirationTime(uint32_t* _retval) {
+  CacheFileAutoLock lock(this);
+  MOZ_ASSERT(mMetadata);
+  NS_ENSURE_TRUE(mMetadata, NS_ERROR_UNEXPECTED);
+
+  *_retval = mMetadata->GetExpirationTime();
+  return NS_OK;
+}
+
+nsresult CacheFile::SetFrecency(uint32_t aFrecency) {
+  CacheFileAutoLock lock(this);
+
+  LOG(("CacheFile::SetFrecency() this=%p, frecency=%u", this, aFrecency));
+
+  MOZ_ASSERT(mMetadata);
+  NS_ENSURE_TRUE(mMetadata, NS_ERROR_UNEXPECTED);
+
+  PostWriteTimer();
+
+  if (mHandle && !mHandle->IsDoomed()) {
+    CacheFileIOManager::UpdateIndexEntry(mHandle, &aFrecency, nullptr, nullptr,
+                                         nullptr, nullptr);
+  }
+
+  mMetadata->SetFrecency(aFrecency);
+  return NS_OK;
+}
+
+nsresult CacheFile::GetFrecency(uint32_t* _retval) {
+  CacheFileAutoLock lock(this);
+  MOZ_ASSERT(mMetadata);
+  NS_ENSURE_TRUE(mMetadata, NS_ERROR_UNEXPECTED);
+  *_retval = mMetadata->GetFrecency();
+  return NS_OK;
+}
+
+nsresult CacheFile::SetNetworkTimes(uint64_t aOnStartTime,
+                                    uint64_t aOnStopTime) {
+  CacheFileAutoLock lock(this);
+
+  LOG(("CacheFile::SetNetworkTimes() this=%p, aOnStartTime=%" PRIu64
+       ", aOnStopTime=%" PRIu64 "",
+       this, aOnStartTime, aOnStopTime));
+
+  MOZ_ASSERT(mMetadata);
+  NS_ENSURE_TRUE(mMetadata, NS_ERROR_UNEXPECTED);
+
+  PostWriteTimer();
+
+  nsAutoCString onStartTime;
+  onStartTime.AppendInt(aOnStartTime);
+  nsresult rv =
+      mMetadata->SetElement("net-response-time-onstart", onStartTime.get());
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsAutoCString onStopTime;
+  onStopTime.AppendInt(aOnStopTime);
+  rv = mMetadata->SetElement("net-response-time-onstop", onStopTime.get());
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  uint16_t onStartTime16 = aOnStartTime <= kIndexTimeOutOfBound
+                               ? aOnStartTime
+                               : kIndexTimeOutOfBound;
+  uint16_t onStopTime16 =
+      aOnStopTime <= kIndexTimeOutOfBound ? aOnStopTime : kIndexTimeOutOfBound;
+
+  if (mHandle && !mHandle->IsDoomed()) {
+    CacheFileIOManager::UpdateIndexEntry(
+        mHandle, nullptr, nullptr, &onStartTime16, &onStopTime16, nullptr);
+  }
+  return NS_OK;
+}
+
+nsresult CacheFile::GetOnStartTime(uint64_t* _retval) {
+  CacheFileAutoLock lock(this);
+
+  MOZ_ASSERT(mMetadata);
+  const char* onStartTimeStr =
+      mMetadata->GetElement("net-response-time-onstart");
+  if (!onStartTimeStr) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+  nsresult rv;
+  *_retval = nsDependentCString(onStartTimeStr).ToInteger64(&rv);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+  return NS_OK;
+}
+
+nsresult CacheFile::GetOnStopTime(uint64_t* _retval) {
+  CacheFileAutoLock lock(this);
+
+  MOZ_ASSERT(mMetadata);
+  const char* onStopTimeStr = mMetadata->GetElement("net-response-time-onstop");
+  if (!onStopTimeStr) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+  nsresult rv;
+  *_retval = nsDependentCString(onStopTimeStr).ToInteger64(&rv);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+  return NS_OK;
+}
+
+nsresult CacheFile::SetContentType(uint8_t aContentType) {
+  CacheFileAutoLock lock(this);
+
+  LOG(("CacheFile::SetContentType() this=%p, contentType=%u", this,
+       aContentType));
+
+  MOZ_ASSERT(mMetadata);
+  NS_ENSURE_TRUE(mMetadata, NS_ERROR_UNEXPECTED);
+
+  PostWriteTimer();
+
+  // Save the content type to metadata for case we need to rebuild the index.
+  nsAutoCString contentType;
+  contentType.AppendInt(aContentType);
+  nsresult rv = mMetadata->SetElement("ctid", contentType.get());
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  if (mHandle && !mHandle->IsDoomed()) {
+    CacheFileIOManager::UpdateIndexEntry(mHandle, nullptr, nullptr, nullptr,
+                                         nullptr, &aContentType);
+  }
+  return NS_OK;
+}
+
+nsresult CacheFile::SetAltMetadata(const char* aAltMetadata) {
+  AssertOwnsLock();
+  LOG(("CacheFile::SetAltMetadata() this=%p, aAltMetadata=%s", this,
+       aAltMetadata ? aAltMetadata : ""));
+
+  MOZ_ASSERT(mMetadata);
+  NS_ENSURE_TRUE(mMetadata, NS_ERROR_UNEXPECTED);
+
+  PostWriteTimer();
+
+  nsresult rv =
+      mMetadata->SetElement(CacheFileUtils::kAltDataKey, aAltMetadata);
+
+  bool hasAltData = !!aAltMetadata;
+
+  if (NS_FAILED(rv)) {
+    // Removing element shouldn't fail because it doesn't allocate memory.
+    mMetadata->SetElement(CacheFileUtils::kAltDataKey, nullptr);
+
+    mAltDataOffset = -1;
+    mAltDataType.Truncate();
+    hasAltData = false;
+  }
+
+  if (mHandle && !mHandle->IsDoomed()) {
+    CacheFileIOManager::UpdateIndexEntry(mHandle, nullptr, &hasAltData, nullptr,
+                                         nullptr, nullptr);
+  }
+  return rv;
+}
+
+nsresult CacheFile::GetLastModified(uint32_t* _retval) {
+  CacheFileAutoLock lock(this);
+  MOZ_ASSERT(mMetadata);
+  NS_ENSURE_TRUE(mMetadata, NS_ERROR_UNEXPECTED);
+
+  *_retval = mMetadata->GetLastModified();
+  return NS_OK;
+}
+
+nsresult CacheFile::GetLastFetched(uint32_t* _retval) {
+  CacheFileAutoLock lock(this);
+  MOZ_ASSERT(mMetadata);
+  NS_ENSURE_TRUE(mMetadata, NS_ERROR_UNEXPECTED);
+
+  *_retval = mMetadata->GetLastFetched();
+  return NS_OK;
+}
+
+nsresult CacheFile::GetFetchCount(uint32_t* _retval) {
+  CacheFileAutoLock lock(this);
+  MOZ_ASSERT(mMetadata);
+  NS_ENSURE_TRUE(mMetadata, NS_ERROR_UNEXPECTED);
+  *_retval = mMetadata->GetFetchCount();
+  return NS_OK;
+}
+
+nsresult CacheFile::GetDiskStorageSizeInKB(uint32_t* aDiskStorageSize) {
+  CacheFileAutoLock lock(this);
+  if (!mHandle) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  *aDiskStorageSize = mHandle->FileSizeInK();
+  return NS_OK;
+}
+
+nsresult CacheFile::OnFetched() {
+  CacheFileAutoLock lock(this);
+
+  LOG(("CacheFile::OnFetched() this=%p", this));
+
+  MOZ_ASSERT(mMetadata);
+  NS_ENSURE_TRUE(mMetadata, NS_ERROR_UNEXPECTED);
+
+  PostWriteTimer();
+
+  mMetadata->OnFetched();
+  return NS_OK;
+}
+
+void CacheFile::ReleaseOutsideLock(RefPtr<nsISupports> aObject) {
+  AssertOwnsLock();
+
+  mObjsToRelease.AppendElement(std::move(aObject));
+}
+
+nsresult CacheFile::GetChunkLocked(uint32_t aIndex, ECallerType aCaller,
+                                   CacheFileChunkListener* aCallback,
+                                   CacheFileChunk** _retval) {
+  AssertOwnsLock();
+
+  LOG(("CacheFile::GetChunkLocked() [this=%p, idx=%u, caller=%d, listener=%p]",
+       this, aIndex, aCaller, aCallback));
+
+  MOZ_ASSERT(mReady);
+  MOZ_ASSERT(mHandle || mMemoryOnly || mOpeningFile);
+  MOZ_ASSERT((aCaller == READER && aCallback) ||
+             (aCaller == WRITER && !aCallback) ||
+             (aCaller == PRELOADER && !aCallback));
+
+  // Preload chunks from disk when this is disk backed entry and the listener
+  // is reader.
+  bool preload = !mMemoryOnly && (aCaller == READER);
+
+  nsresult rv;
+
+  RefPtr<CacheFileChunk> chunk;
+  if (mChunks.Get(aIndex, getter_AddRefs(chunk))) {
+    LOG(("CacheFile::GetChunkLocked() - Found chunk %p in mChunks [this=%p]",
+         chunk.get(), this));
+
+    // Preloader calls this method to preload only non-loaded chunks.
+    MOZ_ASSERT(aCaller != PRELOADER, "Unexpected!");
+
+    // We might get failed chunk between releasing the lock in
+    // CacheFileChunk::OnDataWritten/Read and CacheFile::OnChunkWritten/Read
+    rv = chunk->GetStatus();
+    if (NS_FAILED(rv)) {
+      SetError(rv);
+      LOG(
+          ("CacheFile::GetChunkLocked() - Found failed chunk in mChunks "
+           "[this=%p]",
+           this));
+      return rv;
+    }
+
+    if (chunk->IsReady() || aCaller == WRITER) {
+      chunk.swap(*_retval);
+    } else {
+      QueueChunkListener(aIndex, aCallback);
+    }
+
+    if (preload) {
+      PreloadChunks(aIndex + 1);
+    }
+
+    return NS_OK;
+  }
+
+  if (mCachedChunks.Get(aIndex, getter_AddRefs(chunk))) {
+    LOG(("CacheFile::GetChunkLocked() - Reusing cached chunk %p [this=%p]",
+         chunk.get(), this));
+
+    // Preloader calls this method to preload only non-loaded chunks.
+    MOZ_ASSERT(aCaller != PRELOADER, "Unexpected!");
+
+    mChunks.InsertOrUpdate(aIndex, RefPtr{chunk});
+    mCachedChunks.Remove(aIndex);
+    chunk->mFile = this;
+    chunk->mActiveChunk = true;
+
+    MOZ_ASSERT(chunk->IsReady());
+
+    chunk.swap(*_retval);
+
+    if (preload) {
+      PreloadChunks(aIndex + 1);
+    }
+
+    return NS_OK;
+  }
+
+  int64_t off = aIndex * static_cast<int64_t>(kChunkSize);
+
+  if (off < mDataSize) {
+    // We cannot be here if this is memory only entry since the chunk must exist
+    MOZ_ASSERT(!mMemoryOnly);
+    if (mMemoryOnly) {
+      // If this ever really happen it is better to fail rather than crashing on
+      // a null handle.
+      LOG(
+          ("CacheFile::GetChunkLocked() - Unexpected state! Offset < mDataSize "
+           "for memory-only entry. [this=%p, off=%" PRId64
+           ", mDataSize=%" PRId64 "]",
+           this, off, mDataSize));
+
+      return NS_ERROR_UNEXPECTED;
+    }
+
+    chunk = new CacheFileChunk(this, aIndex, aCaller == WRITER);
+    mChunks.InsertOrUpdate(aIndex, RefPtr{chunk});
+    chunk->mActiveChunk = true;
+
+    LOG(
+        ("CacheFile::GetChunkLocked() - Reading newly created chunk %p from "
+         "the disk [this=%p]",
+         chunk.get(), this));
+
+    // Read the chunk from the disk
+    rv = chunk->Read(mHandle,
+                     std::min(static_cast<uint32_t>(mDataSize - off),
+                              static_cast<uint32_t>(kChunkSize)),
+                     mMetadata->GetHash(aIndex), this);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      RemoveChunkInternal(chunk, false);
+      return rv;
+    }
+
+    if (aCaller == WRITER) {
+      chunk.swap(*_retval);
+    } else if (aCaller != PRELOADER) {
+      QueueChunkListener(aIndex, aCallback);
+    }
+
+    if (preload) {
+      PreloadChunks(aIndex + 1);
+    }
+
+    return NS_OK;
+  }
+  if (off == mDataSize) {
+    if (aCaller == WRITER) {
+      // this listener is going to write to the chunk
+      chunk = new CacheFileChunk(this, aIndex, true);
+      mChunks.InsertOrUpdate(aIndex, RefPtr{chunk});
+      chunk->mActiveChunk = true;
+
+      LOG(("CacheFile::GetChunkLocked() - Created new empty chunk %p [this=%p]",
+           chunk.get(), this));
+
+      chunk->InitNew();
+      mMetadata->SetHash(aIndex, chunk->Hash());
+
+      if (HaveChunkListeners(aIndex)) {
+        rv = NotifyChunkListeners(aIndex, NS_OK, chunk);
+        NS_ENSURE_SUCCESS(rv, rv);
+      }
+
+      chunk.swap(*_retval);
+      return NS_OK;
+    }
+  } else {
+    if (aCaller == WRITER) {
+      // this chunk was requested by writer, but we need to fill the gap first
+
+      // Fill with zero the last chunk if it is incomplete
+      if (mDataSize % kChunkSize) {
+        rv = PadChunkWithZeroes(mDataSize / kChunkSize);
+        NS_ENSURE_SUCCESS(rv, rv);
+
+        MOZ_ASSERT(!(mDataSize % kChunkSize));
+      }
+
+      uint32_t startChunk = mDataSize / kChunkSize;
+
+      if (mMemoryOnly) {
+        // We need to create all missing CacheFileChunks if this is memory-only
+        // entry
+        for (uint32_t i = startChunk; i < aIndex; i++) {
+          rv = PadChunkWithZeroes(i);
+          NS_ENSURE_SUCCESS(rv, rv);
+        }
+      } else {
+        // We don't need to create CacheFileChunk for other empty chunks unless
+        // there is some input stream waiting for this chunk.
+
+        if (startChunk != aIndex) {
+          // Make sure the file contains zeroes at the end of the file
+          rv = CacheFileIOManager::TruncateSeekSetEOF(
+              mHandle, startChunk * kChunkSize, aIndex * kChunkSize, nullptr);
+          NS_ENSURE_SUCCESS(rv, rv);
+        }
+
+        for (uint32_t i = startChunk; i < aIndex; i++) {
+          if (HaveChunkListeners(i)) {
+            rv = PadChunkWithZeroes(i);
+            NS_ENSURE_SUCCESS(rv, rv);
+          } else {
+            mMetadata->SetHash(i, kEmptyChunkHash);
+            mDataSize = (i + 1) * kChunkSize;
+          }
+        }
+      }
+
+      MOZ_ASSERT(mDataSize == off);
+      rv = GetChunkLocked(aIndex, WRITER, nullptr, getter_AddRefs(chunk));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      chunk.swap(*_retval);
+      return NS_OK;
+    }
+  }
+
+  // We can be here only if the caller is reader since writer always create a
+  // new chunk above and preloader calls this method to preload only chunks that
+  // are not loaded but that do exist.
+  MOZ_ASSERT(aCaller == READER, "Unexpected!");
+
+  if (mOutput) {
+    // the chunk doesn't exist but mOutput may create it
+    QueueChunkListener(aIndex, aCallback);
+  } else {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  return NS_OK;
+}
+
+void CacheFile::PreloadChunks(uint32_t aIndex) {
+  AssertOwnsLock();
+
+  uint32_t limit = aIndex + mPreloadChunkCount;
+
+  for (uint32_t i = aIndex; i < limit; ++i) {
+    int64_t off = i * static_cast<int64_t>(kChunkSize);
+
+    if (off >= mDataSize) {
+      // This chunk is beyond EOF.
+      return;
+    }
+
+    if (mChunks.GetWeak(i) || mCachedChunks.GetWeak(i)) {
+      // This chunk is already in memory or is being read right now.
+      continue;
+    }
+
+    LOG(("CacheFile::PreloadChunks() - Preloading chunk [this=%p, idx=%u]",
+         this, i));
+
+    RefPtr<CacheFileChunk> chunk;
+    GetChunkLocked(i, PRELOADER, nullptr, getter_AddRefs(chunk));
+    // We've checked that we don't have this chunk, so no chunk must be
+    // returned.
+    MOZ_ASSERT(!chunk);
+  }
+}
+
+bool CacheFile::ShouldCacheChunk(uint32_t aIndex) {
+  AssertOwnsLock();
+
+#ifdef CACHE_CHUNKS
+  // We cache all chunks.
+  return true;
+#else
+
+  if (mPreloadChunkCount != 0 && mInputs.Length() == 0 &&
+      mPreloadWithoutInputStreams && aIndex < mPreloadChunkCount) {
+    // We don't have any input stream yet, but it is likely that some will be
+    // opened soon. Keep first mPreloadChunkCount chunks in memory. The
+    // condition is here instead of in MustKeepCachedChunk() since these
+    // chunks should be preloaded and can be kept in memory as an optimization,
+    // but they can be released at any time until they are considered as
+    // preloaded chunks for any input stream.
+    return true;
+  }
+
+  // Cache only chunks that we really need to keep.
+  return MustKeepCachedChunk(aIndex);
+#endif
+}
+
+bool CacheFile::MustKeepCachedChunk(uint32_t aIndex) {
+  AssertOwnsLock();
+
+  // We must keep the chunk when this is memory only entry or we don't have
+  // a handle yet.
+  if (mMemoryOnly || mOpeningFile) {
+    return true;
+  }
+
+  if (mPreloadChunkCount == 0) {
+    // Preloading of chunks is disabled
+    return false;
+  }
+
+  // Check whether this chunk should be considered as preloaded chunk for any
+  // existing input stream.
+
+  // maxPos is the position of the last byte in the given chunk
+  int64_t maxPos = static_cast<int64_t>(aIndex + 1) * kChunkSize - 1;
+
+  // minPos is the position of the first byte in a chunk that precedes the given
+  // chunk by mPreloadChunkCount chunks
+  int64_t minPos;
+  if (mPreloadChunkCount >= aIndex) {
+    minPos = 0;
+  } else {
+    minPos = static_cast<int64_t>(aIndex - mPreloadChunkCount) * kChunkSize;
+  }
+
+  for (uint32_t i = 0; i < mInputs.Length(); ++i) {
+    int64_t inputPos = mInputs[i]->GetPosition();
+    if (inputPos >= minPos && inputPos <= maxPos) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+nsresult CacheFile::DeactivateChunk(CacheFileChunk* aChunk) {
+  nsresult rv;
+
+  // Avoid lock reentrancy by increasing the RefCnt
+  RefPtr<CacheFileChunk> chunk = aChunk;
+
+  {
+    CacheFileAutoLock lock(this);
+
+    LOG(("CacheFile::DeactivateChunk() [this=%p, chunk=%p, idx=%u]", this,
+         aChunk, aChunk->Index()));
+
+    MOZ_ASSERT(mReady);
+    MOZ_ASSERT((mHandle && !mMemoryOnly && !mOpeningFile) ||
+               (!mHandle && mMemoryOnly && !mOpeningFile) ||
+               (!mHandle && !mMemoryOnly && mOpeningFile));
+
+    if (aChunk->mRefCnt != 2) {
+      LOG(
+          ("CacheFile::DeactivateChunk() - Chunk is still used [this=%p, "
+           "chunk=%p, refcnt=%" PRIuPTR "]",
+           this, aChunk, aChunk->mRefCnt.get()));
+
+      // somebody got the reference before the lock was acquired
+      return NS_OK;
+    }
+
+    if (aChunk->mDiscardedChunk) {
+      aChunk->mActiveChunk = false;
+      ReleaseOutsideLock(
+          RefPtr<CacheFileChunkListener>(std::move(aChunk->mFile)));
+
+      DebugOnly<bool> removed = mDiscardedChunks.RemoveElement(aChunk);
+      MOZ_ASSERT(removed);
+      return NS_OK;
+    }
+
+#ifdef DEBUG
+    {
+      // We can be here iff the chunk is in the hash table
+      RefPtr<CacheFileChunk> chunkCheck;
+      mChunks.Get(chunk->Index(), getter_AddRefs(chunkCheck));
+      MOZ_ASSERT(chunkCheck == chunk);
+
+      // We also shouldn't have any queued listener for this chunk
+      ChunkListeners* listeners;
+      mChunkListeners.Get(chunk->Index(), &listeners);
+      MOZ_ASSERT(!listeners);
+    }
+#endif
+
+    if (NS_FAILED(chunk->GetStatus())) {
+      SetError(chunk->GetStatus());
+    }
+
+    if (NS_FAILED(mStatus)) {
+      // Don't write any chunk to disk since this entry will be doomed
+      LOG(
+          ("CacheFile::DeactivateChunk() - Releasing chunk because of status "
+           "[this=%p, chunk=%p, mStatus=0x%08" PRIx32 "]",
+           this, chunk.get(), static_cast<uint32_t>(mStatus)));
+
+      RemoveChunkInternal(chunk, false);
+      return mStatus;
+    }
+
+    if (chunk->IsDirty() && !mMemoryOnly && !mOpeningFile) {
+      LOG(
+          ("CacheFile::DeactivateChunk() - Writing dirty chunk to the disk "
+           "[this=%p]",
+           this));
+
+      mDataIsDirty = true;
+
+      rv = chunk->Write(mHandle, this);
+      if (NS_FAILED(rv)) {
+        LOG(
+            ("CacheFile::DeactivateChunk() - CacheFileChunk::Write() failed "
+             "synchronously. Removing it. [this=%p, chunk=%p, rv=0x%08" PRIx32
+             "]",
+             this, chunk.get(), static_cast<uint32_t>(rv)));
+
+        RemoveChunkInternal(chunk, false);
+
+        SetError(rv);
+        return rv;
+      }
+
+      // Chunk will be removed in OnChunkWritten if it is still unused
+
+      // chunk needs to be released under the lock to be able to rely on
+      // CacheFileChunk::mRefCnt in CacheFile::OnChunkWritten()
+      chunk = nullptr;
+      return NS_OK;
+    }
+
+    bool keepChunk = ShouldCacheChunk(aChunk->Index());
+    LOG(("CacheFile::DeactivateChunk() - %s unused chunk [this=%p, chunk=%p]",
+         keepChunk ? "Caching" : "Releasing", this, chunk.get()));
+
+    RemoveChunkInternal(chunk, keepChunk);
+
+    if (!mMemoryOnly) WriteMetadataIfNeededLocked();
+  }
+
+  return NS_OK;
+}
+
+void CacheFile::RemoveChunkInternal(CacheFileChunk* aChunk, bool aCacheChunk) {
+  AssertOwnsLock();
+
+  aChunk->mActiveChunk = false;
+  ReleaseOutsideLock(RefPtr<CacheFileChunkListener>(std::move(aChunk->mFile)));
+
+  if (aCacheChunk) {
+    mCachedChunks.InsertOrUpdate(aChunk->Index(), RefPtr{aChunk});
+  }
+
+  mChunks.Remove(aChunk->Index());
+}
+
+bool CacheFile::OutputStreamExists(bool aAlternativeData) {
+  AssertOwnsLock();
+
+  if (!mOutput) {
+    return false;
+  }
+
+  return mOutput->IsAlternativeData() == aAlternativeData;
+}
+
+int64_t CacheFile::BytesFromChunk(uint32_t aIndex, bool aAlternativeData) {
+  AssertOwnsLock();
+
+  int64_t dataSize;
+
+  if (mAltDataOffset != -1) {
+    if (aAlternativeData) {
+      dataSize = mDataSize;
+    } else {
+      dataSize = mAltDataOffset;
+    }
+  } else {
+    MOZ_ASSERT(!aAlternativeData);
+    dataSize = mDataSize;
+  }
+
+  if (!dataSize) {
+    return 0;
+  }
+
+  // Index of the last existing chunk.
+  uint32_t lastChunk = (dataSize - 1) / kChunkSize;
+  if (aIndex > lastChunk) {
+    return 0;
+  }
+
+  // We can use only preloaded chunks for the given stream to calculate
+  // available bytes if this is an entry stored on disk, since only those
+  // chunks are guaranteed not to be released.
+  uint32_t maxPreloadedChunk;
+  if (mMemoryOnly) {
+    maxPreloadedChunk = lastChunk;
+  } else {
+    maxPreloadedChunk = std::min(aIndex + mPreloadChunkCount, lastChunk);
+  }
+
+  uint32_t i;
+  for (i = aIndex; i <= maxPreloadedChunk; ++i) {
+    CacheFileChunk* chunk;
+
+    chunk = mChunks.GetWeak(i);
+    if (chunk) {
+      MOZ_ASSERT(i == lastChunk || chunk->DataSize() == kChunkSize);
+      if (chunk->IsReady()) {
+        continue;
+      }
+
+      // don't search this chunk in cached
+      break;
+    }
+
+    chunk = mCachedChunks.GetWeak(i);
+    if (chunk) {
+      MOZ_ASSERT(i == lastChunk || chunk->DataSize() == kChunkSize);
+      continue;
+    }
+
+    break;
+  }
+
+  // theoretic bytes in advance
+  int64_t advance = int64_t(i - aIndex) * kChunkSize;
+  // real bytes till the end of the file
+  int64_t tail = dataSize - (aIndex * kChunkSize);
+
+  return std::min(advance, tail);
+}
+
+nsresult CacheFile::Truncate(int64_t aOffset) {
+  AssertOwnsLock();
+
+  LOG(("CacheFile::Truncate() [this=%p, offset=%" PRId64 "]", this, aOffset));
+
+  nsresult rv;
+
+  // If we ever need to truncate on non alt-data boundary, we need to handle
+  // existing input streams.
+  MOZ_ASSERT(aOffset == mAltDataOffset,
+             "Truncating normal data not implemented");
+  MOZ_ASSERT(mReady);
+  MOZ_ASSERT(!mOutput);
+
+  uint32_t lastChunk = 0;
+  if (mDataSize > 0) {
+    lastChunk = (mDataSize - 1) / kChunkSize;
+  }
+
+  uint32_t newLastChunk = 0;
+  if (aOffset > 0) {
+    newLastChunk = (aOffset - 1) / kChunkSize;
+  }
+
+  uint32_t bytesInNewLastChunk = aOffset - newLastChunk * kChunkSize;
+
+  LOG(
+      ("CacheFileTruncate() - lastChunk=%u, newLastChunk=%u, "
+       "bytesInNewLastChunk=%u",
+       lastChunk, newLastChunk, bytesInNewLastChunk));
+
+  // Remove all truncated chunks from mCachedChunks
+  for (auto iter = mCachedChunks.Iter(); !iter.Done(); iter.Next()) {
+    uint32_t idx = iter.Key();
+
+    if (idx > newLastChunk) {
+      // This is unused chunk, simply remove it.
+      LOG(("CacheFile::Truncate() - removing cached chunk [idx=%u]", idx));
+      iter.Remove();
+    }
+  }
+
+  // We need to make sure no input stream holds a reference to a chunk we're
+  // going to discard. In theory, if alt-data begins at chunk boundary, input
+  // stream for normal data can get the chunk containing only alt-data via
+  // EnsureCorrectChunk() call. The input stream won't read the data from such
+  // chunk, but it will keep the reference until the stream is closed and we
+  // cannot simply discard this chunk.
+  int64_t maxInputChunk = -1;
+  for (uint32_t i = 0; i < mInputs.Length(); ++i) {
+    int64_t inputChunk = mInputs[i]->GetChunkIdx();
+
+    if (maxInputChunk < inputChunk) {
+      maxInputChunk = inputChunk;
+    }
+
+    MOZ_RELEASE_ASSERT(mInputs[i]->GetPosition() <= aOffset);
+  }
+
+  MOZ_RELEASE_ASSERT(maxInputChunk <= newLastChunk + 1);
+  if (maxInputChunk == newLastChunk + 1) {
+    // Truncating must be done at chunk boundary
+    MOZ_RELEASE_ASSERT(bytesInNewLastChunk == kChunkSize);
+    newLastChunk++;
+    bytesInNewLastChunk = 0;
+    LOG(
+        ("CacheFile::Truncate() - chunk %p is still in use, using "
+         "newLastChunk=%u and bytesInNewLastChunk=%u",
+         mChunks.GetWeak(newLastChunk), newLastChunk, bytesInNewLastChunk));
+  }
+
+  // Discard all truncated chunks in mChunks
+  for (auto iter = mChunks.Iter(); !iter.Done(); iter.Next()) {
+    uint32_t idx = iter.Key();
+
+    if (idx > newLastChunk) {
+      RefPtr<CacheFileChunk>& chunk = iter.Data();
+      LOG(("CacheFile::Truncate() - discarding chunk [idx=%u, chunk=%p]", idx,
+           chunk.get()));
+
+      if (HaveChunkListeners(idx)) {
+        NotifyChunkListeners(idx, NS_ERROR_NOT_AVAILABLE, chunk);
+      }
+
+      chunk->mDiscardedChunk = true;
+      mDiscardedChunks.AppendElement(chunk);
+      iter.Remove();
+    }
+  }
+
+  // Remove hashes of all removed chunks from the metadata
+  for (uint32_t i = lastChunk; i > newLastChunk; --i) {
+    mMetadata->RemoveHash(i);
+  }
+
+  // Truncate new last chunk
+  if (bytesInNewLastChunk == kChunkSize) {
+    LOG(("CacheFile::Truncate() - not truncating last chunk."));
+  } else {
+    RefPtr<CacheFileChunk> chunk;
+    if (mChunks.Get(newLastChunk, getter_AddRefs(chunk))) {
+      LOG(("CacheFile::Truncate() - New last chunk %p got from mChunks.",
+           chunk.get()));
+    } else if (mCachedChunks.Get(newLastChunk, getter_AddRefs(chunk))) {
+      LOG(("CacheFile::Truncate() - New last chunk %p got from mCachedChunks.",
+           chunk.get()));
+    } else {
+      // New last chunk isn't loaded but we need to update the hash.
+      MOZ_ASSERT(!mMemoryOnly);
+      MOZ_ASSERT(mHandle);
+
+      rv = GetChunkLocked(newLastChunk, PRELOADER, nullptr,
+                          getter_AddRefs(chunk));
+      if (NS_FAILED(rv)) {
+        return rv;
+      }
+      // We've checked that we don't have this chunk, so no chunk must be
+      // returned.
+      MOZ_ASSERT(!chunk);
+
+      if (!mChunks.Get(newLastChunk, getter_AddRefs(chunk))) {
+        return NS_ERROR_UNEXPECTED;
+      }
+
+      LOG(("CacheFile::Truncate() - New last chunk %p got from preloader.",
+           chunk.get()));
+    }
+
+    rv = chunk->GetStatus();
+    if (NS_FAILED(rv)) {
+      LOG(
+          ("CacheFile::Truncate() - New last chunk is failed "
+           "[status=0x%08" PRIx32 "]",
+           static_cast<uint32_t>(rv)));
+      return rv;
+    }
+
+    chunk->Truncate(bytesInNewLastChunk);
+
+    // If the chunk is ready set the new hash now. If it's still being loaded
+    // CacheChunk::Truncate() made the chunk dirty and the hash will be updated
+    // in OnChunkWritten().
+    if (chunk->IsReady()) {
+      mMetadata->SetHash(newLastChunk, chunk->Hash());
+    }
+  }
+
+  if (mHandle) {
+    rv = CacheFileIOManager::TruncateSeekSetEOF(mHandle, aOffset, aOffset,
+                                                nullptr);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+  }
+
+  mDataSize = aOffset;
+
+  return NS_OK;
+}
+
+static uint32_t StatusToTelemetryEnum(nsresult aStatus) {
+  if (NS_SUCCEEDED(aStatus)) {
+    return 0;
+  }
+
+  switch (aStatus) {
+    case NS_BASE_STREAM_CLOSED:
+      return 0;  // Log this as a success
+    case NS_ERROR_OUT_OF_MEMORY:
+      return 2;
+    case NS_ERROR_FILE_NO_DEVICE_SPACE:
+      return 3;
+    case NS_ERROR_FILE_CORRUPTED:
+      return 4;
+    case NS_ERROR_FILE_NOT_FOUND:
+      return 5;
+    case NS_BINDING_ABORTED:
+      return 6;
+    default:
+      return 1;  // other error
+  }
+
+  MOZ_ASSERT_UNREACHABLE("We should never get here");
+}
+
+void CacheFile::RemoveInput(CacheFileInputStream* aInput, nsresult aStatus) {
+  AssertOwnsLock();
+
+  LOG(("CacheFile::RemoveInput() [this=%p, input=%p, status=0x%08" PRIx32 "]",
+       this, aInput, static_cast<uint32_t>(aStatus)));
+
+  DebugOnly<bool> found{};
+  found = mInputs.RemoveElement(aInput);
+  MOZ_ASSERT(found);
+
+  ReleaseOutsideLock(
+      already_AddRefed<nsIInputStream>(static_cast<nsIInputStream*>(aInput)));
+
+  if (!mMemoryOnly) WriteMetadataIfNeededLocked();
+
+  // If the input didn't read all data, there might be left some preloaded
+  // chunks that won't be used anymore.
+  CleanUpCachedChunks();
+
+  Telemetry::Accumulate(Telemetry::NETWORK_CACHE_V2_INPUT_STREAM_STATUS,
+                        StatusToTelemetryEnum(aStatus));
+}
+
+void CacheFile::RemoveOutput(CacheFileOutputStream* aOutput, nsresult aStatus) {
+  AssertOwnsLock();
+
+  nsresult rv;
+
+  LOG(("CacheFile::RemoveOutput() [this=%p, output=%p, status=0x%08" PRIx32 "]",
+       this, aOutput, static_cast<uint32_t>(aStatus)));
+
+  if (mOutput != aOutput) {
+    LOG(
+        ("CacheFile::RemoveOutput() - This output was already removed, ignoring"
+         " call [this=%p]",
+         this));
+    return;
+  }
+
+  mOutput = nullptr;
+
+  // Cancel all queued chunk and update listeners that cannot be satisfied
+  NotifyListenersAboutOutputRemoval();
+
+  if (!mMemoryOnly) WriteMetadataIfNeededLocked();
+
+  // Make sure the CacheFile status is set to a failure when the output stream
+  // is closed with a fatal error.  This way we propagate correctly and w/o any
+  // windows the failure state of this entry to end consumers.
+  if (NS_SUCCEEDED(mStatus) && NS_FAILED(aStatus) &&
+      aStatus != NS_BASE_STREAM_CLOSED) {
+    if (aOutput->IsAlternativeData()) {
+      MOZ_ASSERT(mAltDataOffset != -1);
+      // If there is no alt-data input stream truncate only alt-data, otherwise
+      // doom the entry.
+      bool altDataInputExists = false;
+      for (uint32_t i = 0; i < mInputs.Length(); ++i) {
+        if (mInputs[i]->IsAlternativeData()) {
+          altDataInputExists = true;
+          break;
+        }
+      }
+      if (altDataInputExists) {
+        SetError(aStatus);
+      } else {
+        rv = Truncate(mAltDataOffset);
+        if (NS_FAILED(rv)) {
+          LOG(
+              ("CacheFile::RemoveOutput() - Truncating alt-data failed "
+               "[rv=0x%08" PRIx32 "]",
+               static_cast<uint32_t>(rv)));
+          SetError(aStatus);
+        } else {
+          SetAltMetadata(nullptr);
+          mAltDataOffset = -1;
+          mAltDataType.Truncate();
+        }
+      }
+    } else {
+      SetError(aStatus);
+    }
+  }
+
+  // Notify close listener as the last action
+  aOutput->NotifyCloseListener();
+
+  Telemetry::Accumulate(Telemetry::NETWORK_CACHE_V2_OUTPUT_STREAM_STATUS,
+                        StatusToTelemetryEnum(aStatus));
+}
+
+nsresult CacheFile::NotifyChunkListener(CacheFileChunkListener* aCallback,
+                                        nsIEventTarget* aTarget,
+                                        nsresult aResult, uint32_t aChunkIdx,
+                                        CacheFileChunk* aChunk) {
+  LOG(
+      ("CacheFile::NotifyChunkListener() [this=%p, listener=%p, target=%p, "
+       "rv=0x%08" PRIx32 ", idx=%u, chunk=%p]",
+       this, aCallback, aTarget, static_cast<uint32_t>(aResult), aChunkIdx,
+       aChunk));
+
+  RefPtr<NotifyChunkListenerEvent> ev;
+  ev = new NotifyChunkListenerEvent(aCallback, aResult, aChunkIdx, aChunk);
+  if (aTarget) {
+    return aTarget->Dispatch(ev, NS_DISPATCH_NORMAL);
+  }
+  return NS_DispatchToCurrentThread(ev);
+}
+
+void CacheFile::QueueChunkListener(uint32_t aIndex,
+                                   CacheFileChunkListener* aCallback) {
+  LOG(("CacheFile::QueueChunkListener() [this=%p, idx=%u, listener=%p]", this,
+       aIndex, aCallback));
+
+  AssertOwnsLock();
+
+  MOZ_ASSERT(aCallback);
+
+  ChunkListenerItem* item = new ChunkListenerItem();
+  item->mTarget = CacheFileIOManager::IOTarget();
+  if (!item->mTarget) {
+    LOG(
+        ("CacheFile::QueueChunkListener() - Cannot get Cache I/O thread! Using "
+         "main thread for callback."));
+    item->mTarget = GetMainThreadSerialEventTarget();
+  }
+  item->mCallback = aCallback;
+
+  mChunkListeners.GetOrInsertNew(aIndex)->mItems.AppendElement(item);
+}
+
+nsresult CacheFile::NotifyChunkListeners(uint32_t aIndex, nsresult aResult,
+                                         CacheFileChunk* aChunk) {
+  LOG(("CacheFile::NotifyChunkListeners() [this=%p, idx=%u, rv=0x%08" PRIx32
+       ", "
+       "chunk=%p]",
+       this, aIndex, static_cast<uint32_t>(aResult), aChunk));
+
+  AssertOwnsLock();
+
+  nsresult rv, rv2;
+
+  ChunkListeners* listeners;
+  mChunkListeners.Get(aIndex, &listeners);
+  MOZ_ASSERT(listeners);
+
+  rv = NS_OK;
+  for (uint32_t i = 0; i < listeners->mItems.Length(); i++) {
+    ChunkListenerItem* item = listeners->mItems[i];
+    rv2 = NotifyChunkListener(item->mCallback, item->mTarget, aResult, aIndex,
+                              aChunk);
+    if (NS_FAILED(rv2) && NS_SUCCEEDED(rv)) rv = rv2;
+    delete item;
+  }
+
+  mChunkListeners.Remove(aIndex);
+
+  return rv;
+}
+
+bool CacheFile::HaveChunkListeners(uint32_t aIndex) {
+  AssertOwnsLock();
+  ChunkListeners* listeners;
+  mChunkListeners.Get(aIndex, &listeners);
+  return !!listeners;
+}
+
+void CacheFile::NotifyListenersAboutOutputRemoval() {
+  LOG(("CacheFile::NotifyListenersAboutOutputRemoval() [this=%p]", this));
+
+  AssertOwnsLock();
+
+  // First fail all chunk listeners that wait for non-existent chunk
+  for (auto iter = mChunkListeners.Iter(); !iter.Done(); iter.Next()) {
+    uint32_t idx = iter.Key();
+    auto* listeners = iter.UserData();
+
+    LOG(
+        ("CacheFile::NotifyListenersAboutOutputRemoval() - fail "
+         "[this=%p, idx=%u]",
+         this, idx));
+
+    RefPtr<CacheFileChunk> chunk;
+    mChunks.Get(idx, getter_AddRefs(chunk));
+    if (chunk) {
+      // Skip these listeners because the chunk is being read. We don't have
+      // assertion here to check its state because it might be already in READY
+      // state while CacheFile::OnChunkRead() is waiting on Cache I/O thread for
+      // a lock so the listeners hasn't been notified yet. In any case, the
+      // listeners will be notified from CacheFile::OnChunkRead().
+      continue;
+    }
+
+    for (uint32_t i = 0; i < listeners->mItems.Length(); i++) {
+      ChunkListenerItem* item = listeners->mItems[i];
+      NotifyChunkListener(item->mCallback, item->mTarget,
+                          NS_ERROR_NOT_AVAILABLE, idx, nullptr);
+      delete item;
+    }
+
+    iter.Remove();
+  }
+
+  // Fail all update listeners
+  for (const auto& entry : mChunks) {
+    const RefPtr<CacheFileChunk>& chunk = entry.GetData();
+    LOG(
+        ("CacheFile::NotifyListenersAboutOutputRemoval() - fail2 "
+         "[this=%p, idx=%u]",
+         this, entry.GetKey()));
+
+    if (chunk->IsReady()) {
+      chunk->NotifyUpdateListeners();
+    }
+  }
+}
+
+bool CacheFile::DataSize(int64_t* aSize) {
+  CacheFileAutoLock lock(this);
+
+  if (OutputStreamExists(false)) {
+    return false;
+  }
+
+  if (mAltDataOffset == -1) {
+    *aSize = mDataSize;
+  } else {
+    *aSize = mAltDataOffset;
+  }
+
+  return true;
+}
+
+nsresult CacheFile::GetAltDataSize(int64_t* aSize) {
+  CacheFileAutoLock lock(this);
+  if (mOutput) {
+    return NS_ERROR_IN_PROGRESS;
+  }
+
+  if (mAltDataOffset == -1) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  *aSize = mDataSize - mAltDataOffset;
+  return NS_OK;
+}
+
+nsresult CacheFile::GetAltDataType(nsACString& aType) {
+  CacheFileAutoLock lock(this);
+
+  if (mAltDataOffset == -1) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  aType = mAltDataType;
+  return NS_OK;
+}
+
+bool CacheFile::IsDoomed() {
+  CacheFileAutoLock lock(this);
+
+  if (!mHandle) return false;
+
+  return mHandle->IsDoomed();
+}
+
+bool CacheFile::IsWriteInProgress() {
+  CacheFileAutoLock lock(this);
+
+  bool result = false;
+
+  if (!mMemoryOnly) {
+    result =
+        mDataIsDirty || (mMetadata && mMetadata->IsDirty()) || mWritingMetadata;
+  }
+
+  result = result || mOpeningFile || mOutput || mChunks.Count();
+
+  return result;
+}
+
+bool CacheFile::EntryWouldExceedLimit(int64_t aOffset, int64_t aSize,
+                                      bool aIsAltData) {
+  CacheFileAutoLock lock(this);
+
+  if (mSkipSizeCheck || aSize < 0) {
+    return false;
+  }
+
+  int64_t totalSize = aOffset + aSize;
+  if (aIsAltData) {
+    totalSize += (mAltDataOffset == -1) ? mDataSize : mAltDataOffset;
+  }
+
+  return CacheObserver::EntryIsTooBig(totalSize, !mMemoryOnly);
+}
+
+bool CacheFile::IsDirty() { return mDataIsDirty || mMetadata->IsDirty(); }
+
+void CacheFile::WriteMetadataIfNeeded() {
+  LOG(("CacheFile::WriteMetadataIfNeeded() [this=%p]", this));
+
+  CacheFileAutoLock lock(this);
+
+  if (!mMemoryOnly) WriteMetadataIfNeededLocked();
+}
+
+void CacheFile::WriteMetadataIfNeededLocked(bool aFireAndForget) {
+  // When aFireAndForget is set to true, we are called from dtor.
+  // |this| must not be referenced after this method returns!
+
+  LOG(("CacheFile::WriteMetadataIfNeededLocked() [this=%p]", this));
+
+  nsresult rv;
+
+  AssertOwnsLock();
+  MOZ_ASSERT(!mMemoryOnly);
+
+  if (!mMetadata) {
+    MOZ_CRASH("Must have metadata here");
+    return;
+  }
+
+  if (NS_FAILED(mStatus)) return;
+
+  if (!IsDirty() || mOutput || mInputs.Length() || mChunks.Count() ||
+      mWritingMetadata || mOpeningFile || mKill) {
+    return;
+  }
+
+  if (!aFireAndForget) {
+    // if aFireAndForget is set, we are called from dtor. Write
+    // scheduler hard-refers CacheFile otherwise, so we cannot be here.
+    CacheFileIOManager::UnscheduleMetadataWrite(this);
+  }
+
+  LOG(("CacheFile::WriteMetadataIfNeededLocked() - Writing metadata [this=%p]",
+       this));
+
+  rv = mMetadata->WriteMetadata(mDataSize, aFireAndForget ? nullptr : this);
+  if (NS_SUCCEEDED(rv)) {
+    mWritingMetadata = true;
+    mDataIsDirty = false;
+  } else {
+    LOG(
+        ("CacheFile::WriteMetadataIfNeededLocked() - Writing synchronously "
+         "failed [this=%p]",
+         this));
+    // TODO: close streams with error
+    SetError(rv);
+  }
+}
+
+void CacheFile::PostWriteTimer() {
+  if (mMemoryOnly) return;
+  LOG(("CacheFile::PostWriteTimer() [this=%p]", this));
+
+  CacheFileIOManager::ScheduleMetadataWrite(this);
+}
+
+void CacheFile::CleanUpCachedChunks() {
+  for (auto iter = mCachedChunks.Iter(); !iter.Done(); iter.Next()) {
+    uint32_t idx = iter.Key();
+    const RefPtr<CacheFileChunk>& chunk = iter.Data();
+
+    LOG(("CacheFile::CleanUpCachedChunks() [this=%p, idx=%u, chunk=%p]", this,
+         idx, chunk.get()));
+
+    if (MustKeepCachedChunk(idx)) {
+      LOG(("CacheFile::CleanUpCachedChunks() - Keeping chunk"));
+      continue;
+    }
+
+    LOG(("CacheFile::CleanUpCachedChunks() - Removing chunk"));
+    iter.Remove();
+  }
+}
+
+nsresult CacheFile::PadChunkWithZeroes(uint32_t aChunkIdx) {
+  AssertOwnsLock();
+
+  // This method is used to pad last incomplete chunk with zeroes or create
+  // a new chunk full of zeroes
+  MOZ_ASSERT(mDataSize / kChunkSize == aChunkIdx);
+
+  nsresult rv;
+  RefPtr<CacheFileChunk> chunk;
+  rv = GetChunkLocked(aChunkIdx, WRITER, nullptr, getter_AddRefs(chunk));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  LOG(
+      ("CacheFile::PadChunkWithZeroes() - Zeroing hole in chunk %d, range %d-%d"
+       " [this=%p]",
+       aChunkIdx, chunk->DataSize(), kChunkSize - 1, this));
+
+  CacheFileChunkWriteHandle hnd = chunk->GetWriteHandle(kChunkSize);
+  if (!hnd.Buf()) {
+    ReleaseOutsideLock(std::move(chunk));
+    SetError(NS_ERROR_OUT_OF_MEMORY);
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  uint32_t offset = hnd.DataSize();
+  memset(hnd.Buf() + offset, 0, kChunkSize - offset);
+  hnd.UpdateDataSize(offset, kChunkSize - offset);
+
+  ReleaseOutsideLock(std::move(chunk));
+
+  return NS_OK;
+}
+
+void CacheFile::SetError(nsresult aStatus) {
+  AssertOwnsLock();
+
+  if (NS_SUCCEEDED(mStatus)) {
+    mStatus = aStatus;
+    if (mHandle) {
+      CacheFileIOManager::DoomFile(mHandle, nullptr);
+    }
+  }
+}
+
+nsresult CacheFile::InitIndexEntry() {
+  AssertOwnsLock();
+  MOZ_ASSERT(mHandle);
+
+  if (mHandle->IsDoomed()) return NS_OK;
+
+  nsresult rv;
+
+  rv = CacheFileIOManager::InitIndexEntry(
+      mHandle, GetOriginAttrsHash(mMetadata->OriginAttributes()),
+      mMetadata->IsAnonymous(), mPinned);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  uint32_t frecency = mMetadata->GetFrecency();
+
+  bool hasAltData =
+      mMetadata->GetElement(CacheFileUtils::kAltDataKey) != nullptr;
+
+  static auto toUint16 = [](const char* s) -> uint16_t {
+    if (s) {
+      nsresult rv;
+      uint64_t n64 = nsDependentCString(s).ToInteger64(&rv);
+      MOZ_ASSERT(NS_SUCCEEDED(rv));
+      return n64 <= kIndexTimeOutOfBound ? n64 : kIndexTimeOutOfBound;
+    }
+    return kIndexTimeNotAvailable;
+  };
+
+  const char* onStartTimeStr =
+      mMetadata->GetElement("net-response-time-onstart");
+  uint16_t onStartTime = toUint16(onStartTimeStr);
+
+  const char* onStopTimeStr = mMetadata->GetElement("net-response-time-onstop");
+  uint16_t onStopTime = toUint16(onStopTimeStr);
+
+  const char* contentTypeStr = mMetadata->GetElement("ctid");
+  uint8_t contentType = nsICacheEntry::CONTENT_TYPE_UNKNOWN;
+  if (contentTypeStr) {
+    int64_t n64 = nsDependentCString(contentTypeStr).ToInteger64(&rv);
+    if (NS_FAILED(rv) || n64 < nsICacheEntry::CONTENT_TYPE_UNKNOWN ||
+        n64 >= nsICacheEntry::CONTENT_TYPE_LAST) {
+      n64 = nsICacheEntry::CONTENT_TYPE_UNKNOWN;
+    }
+    contentType = n64;
+  }
+
+  rv = CacheFileIOManager::UpdateIndexEntry(
+      mHandle, &frecency, &hasAltData, &onStartTime, &onStopTime, &contentType);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return NS_OK;
+}
+
+size_t CacheFile::SizeOfExcludingThis(
+    mozilla::MallocSizeOf mallocSizeOf) const {
+  CacheFileAutoLock lock(const_cast<CacheFile*>(this));
+
+  size_t n = 0;
+  n += mKey.SizeOfExcludingThisIfUnshared(mallocSizeOf);
+  n += mChunks.ShallowSizeOfExcludingThis(mallocSizeOf);
+  for (const auto& chunk : mChunks.Values()) {
+    n += chunk->SizeOfIncludingThis(mallocSizeOf);
+  }
+  n += mCachedChunks.ShallowSizeOfExcludingThis(mallocSizeOf);
+  for (const auto& chunk : mCachedChunks.Values()) {
+    n += chunk->SizeOfIncludingThis(mallocSizeOf);
+  }
+  // Ignore metadata if it's still being read. It's not safe to access buffers
+  // in CacheFileMetadata because they might be reallocated on another thread
+  // outside CacheFile's lock.
+  if (mMetadata && mReady) {
+    n += mMetadata->SizeOfIncludingThis(mallocSizeOf);
+  }
+
+  // Input streams are not elsewhere reported.
+  n += mInputs.ShallowSizeOfExcludingThis(mallocSizeOf);
+  for (uint32_t i = 0; i < mInputs.Length(); ++i) {
+    n += mInputs[i]->SizeOfIncludingThis(mallocSizeOf);
+  }
+
+  // Output streams are not elsewhere reported.
+  if (mOutput) {
+    n += mOutput->SizeOfIncludingThis(mallocSizeOf);
+  }
+
+  // The listeners are usually classes reported just above.
+  n += mChunkListeners.ShallowSizeOfExcludingThis(mallocSizeOf);
+  n += mObjsToRelease.ShallowSizeOfExcludingThis(mallocSizeOf);
+
+  // mHandle reported directly from CacheFileIOManager.
+
+  return n;
+}
+
+size_t CacheFile::SizeOfIncludingThis(
+    mozilla::MallocSizeOf mallocSizeOf) const {
+  return mallocSizeOf(this) + SizeOfExcludingThis(mallocSizeOf);
+}
+
+}  // namespace mozilla::net