Disk cache: Add explicit support for eviction / deletion...

net/disk_cache/sparse_control.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_DISK_CACHE_SPARSE_CONTROL_H_
 #define NET_DISK_CACHE_SPARSE_CONTROL_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 45 matching lines @@
   // |buf_len| specify the actual data to use and |callback| is the callback
   // to use for asynchronous operations. See the description of the Read /
   // WriteSparseData for details about the arguments. The return value is the
   // number of bytes read or written, or a net error code.
   int StartIO(SparseOperation op, int64 offset, net::IOBuffer* buf,
               int buf_len, net::CompletionCallback* callback);
 
   // Implements Entry::GetAvailableRange().
   int GetAvailableRange(int64 offset, int len, int64* start);
 
+  // Deletes the children entries of |entry|.
+  static void DeleteChildren(EntryImpl* entry);
+
  private:
   // Creates a new sparse entry or opens an aready created entry from disk.
   // These methods just read / write the required info from disk for the current
   // entry, and verify that everything is correct. The return value is a net
   // error code.
   int CreateSparseEntry();
   int OpenSparseEntry(int data_len);
 
   // Opens and closes a child entry. A child entry is a regular EntryImpl object
   // with a key derived from the key of the resource to store and the range
@@ skipping 67 matching lines @@
   int child_offset_;  // Offset to use for the current child.
   int child_len_;  // Bytes to read or write for this child.
   int result_;
 
   DISALLOW_COPY_AND_ASSIGN(SparseControl);
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_SPARSE_CONTROL_H_