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// Copyright (c) 2013 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.
// MtabWatcherLinux listens for mount point changes from a mtab file and
// notifies a StorageMonitorLinux about them.
// MtabWatcherLinux lives on the FILE thread.
#ifndef CHROME_BROWSER_STORAGE_MONITOR_MTAB_WATCHER_LINUX_H_
#define CHROME_BROWSER_STORAGE_MONITOR_MTAB_WATCHER_LINUX_H_
#if defined(OS_CHROMEOS)
#error "ChromeOS does not use MtabWatcherLinux."
#endif
#include <map>
#include "base/basictypes.h"
#include "base/files/file_path.h"
#include "base/files/file_path_watcher.h"
#include "base/memory/weak_ptr.h"
class MtabWatcherLinux {
public:
// (mount point, mount device)
// A mapping from mount point to mount device, as extracted from the mtab
// file.
typedef std::map<base::FilePath, base::FilePath> MountPointDeviceMap;
class Delegate {
public:
virtual ~Delegate() {}
// Parses |new_mtab| and find all changes. Called on the UI thread.
virtual void UpdateMtab(const MountPointDeviceMap& new_mtab) = 0;
};
MtabWatcherLinux(const base::FilePath& mtab_path,
base::WeakPtr<Delegate> delegate);
~MtabWatcherLinux();
private:
// Reads mtab file entries into |mtab|.
void ReadMtab() const;
// Called when |mtab_path_| changes.
void OnFilePathChanged(const base::FilePath& path, bool error);
// Mtab file that lists the mount points.
const base::FilePath mtab_path_;
// Watcher for |mtab_path_|.
base::FilePathWatcher file_watcher_;
base::WeakPtr<Delegate> delegate_;
base::WeakPtrFactory<MtabWatcherLinux> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(MtabWatcherLinux);
};
#endif // CHROME_BROWSER_STORAGE_MONITOR_MTAB_WATCHER_LINUX_H_
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