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121 lines
3.1 KiB
C++
121 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) 2012-2016 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 General Public License version 2.
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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_base : Genode::Connection<Session>, Session_client
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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 tx_buf_size size of transmission buffer in bytes
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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 writable
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*/
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Connection_base(Genode::Range_allocator &tx_block_alloc,
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size_t tx_buf_size = DEFAULT_TX_BUF_SIZE,
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char const *label = "",
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char const *root = "/",
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bool writeable = true)
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:
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Genode::Connection<Session>(
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session("ram_quota=%zd, "
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"tx_buf_size=%zd, "
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"label=\"%s\", "
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"root=\"%s\", "
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"writeable=%d",
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8*1024*sizeof(long) + tx_buf_size,
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tx_buf_size,
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label, root, writeable)),
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Session_client(cap(), tx_block_alloc)
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{ }
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};
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/**
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* A File_system connection that upgrades its RAM quota
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*/
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struct File_system::Connection : File_system::Connection_base
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{
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/* reuse constructor */
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using Connection_base::Connection_base;
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/**
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* Upgrade the session quota in response to Out_of_metadata
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*/
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void upgrade_ram()
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{
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PWRN("upgrading File_system session");
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Genode::env()->parent()->upgrade(cap(), "ram=8K");
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}
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enum { UPGRADE_ATTEMPTS = 2 };
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Dir_handle dir(Path const &path, bool create) override
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{
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return Genode::retry<Out_of_metadata>(
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[&] () { return Session_client::dir(path, create); },
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[&] () { upgrade_ram(); },
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UPGRADE_ATTEMPTS);
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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 Genode::retry<Out_of_metadata>(
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[&] () { return Session_client::file(dir, name, mode, create); },
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[&] () { upgrade_ram(); },
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UPGRADE_ATTEMPTS);
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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 Genode::retry<Out_of_metadata>(
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[&] () { return Session_client::symlink(dir, name, create); },
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[&] () { upgrade_ram(); },
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UPGRADE_ATTEMPTS);
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}
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Node_handle node(Path const &path) override
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{
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return Genode::retry<Out_of_metadata>(
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[&] () { return Session_client::node(path); },
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[&] () { upgrade_ram(); },
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UPGRADE_ATTEMPTS);
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}
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};
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#endif /* _INCLUDE__FILE_SYSTEM_SESSION__CONNECTION_H_ */
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