158 lines
4.5 KiB
C++
158 lines
4.5 KiB
C++
/*
|
|
* \brief Connection to file-system service
|
|
* \author Norman Feske
|
|
* \date 2012-04-05
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2012-2017 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_base : Genode::Connection<Session>, Session_client
|
|
{
|
|
/**
|
|
* Issue session request
|
|
*
|
|
* \noapi
|
|
*/
|
|
Capability<File_system::Session> _session(Genode::Parent &parent,
|
|
char const *label,
|
|
char const *root,
|
|
bool writeable,
|
|
size_t tx_buf_size)
|
|
{
|
|
return session(parent,
|
|
"ram_quota=%ld, "
|
|
"cap_quota=%ld, "
|
|
"tx_buf_size=%ld, "
|
|
"label=\"%s\", "
|
|
"root=\"%s\", "
|
|
"writeable=%d",
|
|
8*1024*sizeof(long) + tx_buf_size,
|
|
CAP_QUOTA,
|
|
tx_buf_size,
|
|
label, root, writeable);
|
|
}
|
|
|
|
/**
|
|
* 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 writable
|
|
* \param tx_buf_size size of transmission buffer in bytes
|
|
*/
|
|
Connection_base(Genode::Env &env,
|
|
Genode::Range_allocator &tx_block_alloc,
|
|
char const *label = "",
|
|
char const *root = "/",
|
|
bool writeable = true,
|
|
size_t tx_buf_size = DEFAULT_TX_BUF_SIZE)
|
|
:
|
|
Genode::Connection<Session>(env, _session(env.parent(), label, root,
|
|
writeable, tx_buf_size)),
|
|
Session_client(cap(), tx_block_alloc, env.rm())
|
|
{ }
|
|
|
|
/**
|
|
* Constructor
|
|
*
|
|
* \noapi
|
|
* \deprecated Use the constructor with 'Env &' as first
|
|
* argument instead
|
|
*/
|
|
Connection_base(Genode::Range_allocator &tx_block_alloc,
|
|
size_t tx_buf_size = DEFAULT_TX_BUF_SIZE,
|
|
char const *label = "",
|
|
char const *root = "/",
|
|
bool writeable = true) __attribute__((deprecated))
|
|
:
|
|
Genode::Connection<Session>(_session(*Genode::env_deprecated()->parent(), label,
|
|
root, writeable, tx_buf_size)),
|
|
Session_client(cap(), tx_block_alloc, *Genode::env_deprecated()->rm_session())
|
|
{ }
|
|
};
|
|
|
|
|
|
/**
|
|
* A File_system connection that upgrades its RAM quota
|
|
*/
|
|
struct File_system::Connection : File_system::Connection_base
|
|
{
|
|
/* reuse constructor */
|
|
using Connection_base::Connection_base;
|
|
|
|
/**
|
|
* Extend session quota on demand while calling an RPC function
|
|
*
|
|
* \noapi
|
|
*/
|
|
template <typename FUNC>
|
|
auto _retry(FUNC func) -> decltype(func())
|
|
{
|
|
enum { UPGRADE_ATTEMPTS = 2 };
|
|
return Genode::retry<Out_of_ram>(
|
|
[&] () {
|
|
return Genode::retry<Out_of_caps>(
|
|
[&] () { return func(); },
|
|
[&] () { File_system::Connection_base::upgrade_caps(2); },
|
|
UPGRADE_ATTEMPTS);
|
|
},
|
|
[&] () { File_system::Connection_base::upgrade_ram(8*1024); },
|
|
UPGRADE_ATTEMPTS);
|
|
}
|
|
|
|
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); });
|
|
}
|
|
};
|
|
|
|
#endif /* _INCLUDE__FILE_SYSTEM_SESSION__CONNECTION_H_ */
|