blob: 65a7551c209bcd6103b3e1153638d76bbfefa478 [file] [log] [blame]
// 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.
#pragma once
#include <zircon/types.h>
#ifdef __Fuchsia__
#include <lib/zx/channel.h>
#include <fs/client.h>
#endif // __Fuchsia__
#include <utility>
namespace fs {
#ifdef __Fuchsia__
// MountChannel functions exactly the same as a channel, except that it
// intentionally destructs by sending a clean "shutdown" signal to the
// underlying filesystem. Up until the point that a remote handle is
// attached to a vnode, this wrapper guarantees not only that the
// underlying handle gets closed on error, but also that the sub-filesystem
// is released (which cleans up the underlying connection to the block
// device).
class MountChannel {
constexpr MountChannel() = default;
explicit MountChannel(zx_handle_t handle)
: channel_(handle) {}
explicit MountChannel(zx::channel channel)
: channel_(std::move(channel)) {}
MountChannel(MountChannel&& other)
: channel_(std::move(other.channel_)) {}
zx::channel TakeChannel() { return std::move(channel_); }
~MountChannel() {
if (channel_.is_valid()) {
vfs_unmount_handle(channel_.release(), 0);
zx::channel channel_;
#endif // __Fuchsia__
} // namespace fs