mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-21 14:37:50 +00:00
114 lines
3.1 KiB
C++
114 lines
3.1 KiB
C++
/*
|
|
* \brief Connection to file-system service
|
|
* \author Norman Feske
|
|
* \date 2012-04-05
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2012-2018 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU Affero General Public License version 3.
|
|
*/
|
|
|
|
#ifndef _INCLUDE__FILE_SYSTEM_SESSION__CONNECTION_H_
|
|
#define _INCLUDE__FILE_SYSTEM_SESSION__CONNECTION_H_
|
|
|
|
#include <file_system_session/client.h>
|
|
#include <base/connection.h>
|
|
#include <base/allocator.h>
|
|
#include <util/retry.h>
|
|
|
|
namespace File_system {
|
|
|
|
struct Connection_base;
|
|
struct Connection;
|
|
|
|
/* recommended packet transmission buffer size */
|
|
enum { DEFAULT_TX_BUF_SIZE = 128*1024 };
|
|
}
|
|
|
|
|
|
/**
|
|
* The base implementation of a File_system connection
|
|
*/
|
|
struct File_system::Connection : Genode::Connection<Session>, Session_client
|
|
{
|
|
/**
|
|
* Extend session quota on demand while calling an RPC function
|
|
*
|
|
* \noapi
|
|
*/
|
|
template <typename FUNC>
|
|
auto _retry(FUNC func) -> decltype(func())
|
|
{
|
|
enum { UPGRADE_ATTEMPTS = ~0U };
|
|
return Genode::retry<Out_of_ram>(
|
|
[&] () {
|
|
return Genode::retry<Out_of_caps>(
|
|
[&] () { return func(); },
|
|
[&] () { File_system::Connection::upgrade_caps(2); },
|
|
UPGRADE_ATTEMPTS);
|
|
},
|
|
[&] () { File_system::Connection::upgrade_ram(8*1024); },
|
|
UPGRADE_ATTEMPTS);
|
|
}
|
|
|
|
/**
|
|
* Constructor
|
|
*
|
|
* \param tx_buffer_alloc allocator used for managing the
|
|
* transmission buffer
|
|
* \param label session label
|
|
* \param root root directory of session
|
|
* \param writeable session is writeable
|
|
* \param tx_buf_size size of transmission buffer in bytes
|
|
*/
|
|
Connection(Genode::Env &env,
|
|
Genode::Range_allocator &tx_block_alloc,
|
|
Label const &label = Label(),
|
|
char const *root = "/",
|
|
bool writeable = true,
|
|
size_t tx_buf_size = DEFAULT_TX_BUF_SIZE)
|
|
:
|
|
Genode::Connection<Session>(env, label,
|
|
Ram_quota { 8*1024*sizeof(long) + tx_buf_size },
|
|
Args("root=\"", root, "\", "
|
|
"writeable=", writeable, ", "
|
|
"tx_buf_size=", tx_buf_size)),
|
|
Session_client(cap(), tx_block_alloc, env.rm())
|
|
{ }
|
|
|
|
Dir_handle dir(Path const &path, bool create) override
|
|
{
|
|
return _retry([&] () {
|
|
return Session_client::dir(path, create); });
|
|
}
|
|
|
|
File_handle file(Dir_handle dir, Name const &name, Mode mode, bool create) override
|
|
{
|
|
return _retry([&] () {
|
|
return Session_client::file(dir, name, mode, create); });
|
|
}
|
|
|
|
Symlink_handle symlink(Dir_handle dir, Name const &name, bool create) override
|
|
{
|
|
return _retry([&] () {
|
|
return Session_client::symlink(dir, name, create); });
|
|
}
|
|
|
|
Node_handle node(Path const &path) override
|
|
{
|
|
return _retry([&] () {
|
|
return Session_client::node(path); });
|
|
}
|
|
|
|
Watch_handle watch(Path const &path) override
|
|
{
|
|
return _retry([&] () {
|
|
return Session_client::watch(path); });
|
|
}
|
|
};
|
|
|
|
#endif /* _INCLUDE__FILE_SYSTEM_SESSION__CONNECTION_H_ */
|