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