native_client_sdk/src/libraries/nacl_io/memfs/mem_fs.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef LIBRARIES_NACL_IO_MEMFS_MEM_FS_H_
   6 #define LIBRARIES_NACL_IO_MEMFS_MEM_FS_H_
   7
   8 #include "nacl_io/filesystem.h"
   9 #include "nacl_io/typed_fs_factory.h"
  10
  11 namespace nacl_io {
  12
  13 class MemFs : public Filesystem {
  14  protected:
  15   MemFs();
  16
  17   using Filesystem::Init;
  18   virtual Error Init(const FsInitArgs& args);
  19
  20   // The protected functions are only used internally and will not
  21   // acquire or release the filesystem's lock themselves.  The caller is
  22   // required to use correct locking as needed.
  23
  24   // Allocate or free an INODE number.
  25   int AllocateINO();
  26   void FreeINO(int ino);
  27
  28   // Find a Node specified node optionally failing if type does not match.
  29   virtual Error FindNode(const Path& path, int type, ScopedNode* out_node);
  30
  31  public:
  32   virtual Error OpenWithMode(const Path& path, int open_flags, mode_t mode,
  33                              ScopedNode* out_node);
  34   virtual Error Unlink(const Path& path);
  35   virtual Error Mkdir(const Path& path, int perm);
  36   virtual Error Rmdir(const Path& path);
  37   virtual Error Remove(const Path& path);
  38   virtual Error Rename(const Path& path, const Path& newpath);
  39
  40  private:
  41   static const int REMOVE_DIR = 1;
  42   static const int REMOVE_FILE = 2;
  43   static const int REMOVE_ALL = REMOVE_DIR | REMOVE_FILE;
  44
  45   Error RemoveInternal(const Path& path, int remove_type);
  46
  47   ScopedNode root_;
  48
  49   friend class TypedFsFactory<MemFs>;
  50   DISALLOW_COPY_AND_ASSIGN(MemFs);
  51 };
  52
  53 }  // namespace nacl_io
  54
  55 #endif  // LIBRARIES_NACL_IO_MEMFS_MEM_FS_H_