// Copyright 2019 The Fuchsia 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 SRC_STORAGE_BLOBFS_RUNNER_H_
#define SRC_STORAGE_BLOBFS_RUNNER_H_

#include <lib/async-loop/cpp/loop.h>
#include <lib/async-loop/default.h>
#include <lib/trace/event.h>
#include <lib/zx/resource.h>
#include <lib/zx/status.h>

#include "src/lib/storage/vfs/cpp/managed_vfs.h"
#include "src/lib/storage/vfs/cpp/vfs.h"
#include "src/lib/storage/vfs/cpp/vnode.h"
#include "src/storage/blobfs/blobfs.h"
#include "src/storage/blobfs/health_check_service.h"
#include "src/storage/blobfs/mount.h"
#include "src/storage/blobfs/query.h"
#include "src/storage/blobfs/vfs_types.h"

namespace blobfs {

class QueryService;

// A wrapper class around a "Blobfs" object which additionally manages external IPC connections.
//
// Using this interface, a caller can initialize a Blobfs object and access the filesystem hierarchy
// through the ulib/fs Vnode classes, but not modify the internal structure of the filesystem.
class Runner : public VfsType {
 public:
  DISALLOW_COPY_ASSIGN_AND_MOVE(Runner);

  virtual ~Runner();

  static zx::status<std::unique_ptr<Runner>> Create(async::Loop* loop,
                                                    std::unique_ptr<BlockDevice> device,
                                                    const MountOptions& options,
                                                    zx::resource vmex_resource);

  // fs::ManagedVfs interface.
  void Shutdown(fs::Vfs::ShutdownCallback closure) final;

  // Serves the root directory of the filesystem using |root| as the server-end of an IPC
  // connection.
  zx_status_t ServeRoot(fidl::ServerEnd<fuchsia_io::Directory> root, ServeLayout layout);

 private:
  explicit Runner(async::Loop* loop, int32_t paging_threads = 1);

  // Check if filesystem is readonly.
  bool IsReadonly() __TA_EXCLUDES(vfs_lock_);

  async::Loop* loop_;
  std::unique_ptr<Blobfs> blobfs_;
  fbl::RefPtr<QueryService> query_svc_;
  fbl::RefPtr<HealthCheckService> health_check_svc_;
};

}  // namespace blobfs

#endif  // SRC_STORAGE_BLOBFS_RUNNER_H_