1 files changed, 47 insertions, 0 deletions
diff --git a/dom/cache/QuotaClient.h b/dom/cache/QuotaClient.h
new file mode 100644
index 0000000000..1bc04c1112
--- /dev/null
+++ b/dom/cache/QuotaClient.h
@@ -0,0 +1,47 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_cache_QuotaClient_h
+#define mozilla_dom_cache_QuotaClient_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/dom/cache/Types.h"
+#include "mozilla/dom/quota/Client.h"
+#include "mozIStorageConnection.h"
+
+namespace mozilla::dom::cache {
+
+already_AddRefed<quota::Client> CreateQuotaClient();
+
+/**
+ * The following functions are used to access the directory padding file. The
+ * directory padding file lives in DOM Cache base directory
+ * (e.g. foo.com/cache/.padding). It is used to keep the current overall padding
+ * size for an origin, so that the QuotaManager doesn't need to access the
+ * database when getting quota clients' usage.
+ *
+ * For the directory padding file, it's only accessed on Quota IO thread
+ * (for getting current usage) and Cache IO threads (for tracking padding size
+ * change). Besides, the padding file is protected by a mutex lock held by
+ * CacheQuotaClient.
+ *
+ * Each padding file should only take 8 bytes (int64_t) to record the overall
+ * padding size. Besides, we use the temporary padding file to indicate if the
+ * previous action is completed successfully. If the temporary file exists, it
+ * represents that the previous action is failed and the content of padding file
+ * cannot be trusted, and we need to restore the padding file from the database.
+ */
+
+nsresult RestorePaddingFile(nsIFile* aBaseDir, mozIStorageConnection* aConn);
+
+nsresult WipePaddingFile(const CacheDirectoryMetadata& aDirectoryMetadata,
+                         nsIFile* aBaseDir);
+
+extern const nsLiteralString kCachesSQLiteFilename;
+
+}  // namespace mozilla::dom::cache
+
+#endif  // mozilla_dom_cache_QuotaClient_h