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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_STORAGE_MONITOR_MTAB_WATCHER_LINUX_H_
#define COMPONENTS_STORAGE_MONITOR_MTAB_WATCHER_LINUX_H_
#include <map>
#include "base/files/file_path.h"
#include "base/files/file_path_watcher.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "build/build_config.h"
#if BUILDFLAG(IS_CHROMEOS)
#error "ChromeOS does not use MtabWatcherLinux."
#endif
namespace storage_monitor {
// MtabWatcherLinux listens for mount point changes from a mtab file and
// notifies a StorageMonitorLinux about them. This class should be created and
// destroyed on a single sequence suitable for file IO.
class MtabWatcherLinux {
public:
// (mount point, mount device)
// A mapping from mount point to mount device, as extracted from the mtab
// file.
using MountPointDeviceMap = std::map<base::FilePath, base::FilePath>;
using UpdateMtabCallback =
base::RepeatingCallback<void(const MountPointDeviceMap& new_mtab)>;
// |callback| is called on the same sequence as the rest of the class.
// Caller is responsible for bouncing to the correct sequence.
MtabWatcherLinux(const base::FilePath& mtab_path,
const UpdateMtabCallback& callback);
MtabWatcherLinux(const MtabWatcherLinux&) = delete;
MtabWatcherLinux& operator=(const MtabWatcherLinux&) = delete;
~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_;
UpdateMtabCallback callback_;
SEQUENCE_CHECKER(sequence_checker_);
base::WeakPtrFactory<MtabWatcherLinux> weak_ptr_factory_{this};
};
} // namespace storage_monitor
#endif // COMPONENTS_STORAGE_MONITOR_MTAB_WATCHER_LINUX_H_
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