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2c8beb462f
This patch changes the way of how the client-selected sub directory is communicated to the server. The former opaque session argument is now passed as last label element, which allows for the flexible tweaking of this argument by init's session-routing and label-rewriting mechansims. In particular, it alleviates the need for creating chroot component instances. This change requires the following four adaptations at the configuration level: - Each file-system session request must now carry a path starting with / as last session arguments. Hence, <vfs> <fs> nodes that feature a 'label' attributes must extend the attribute value with " -> /". For <fs> nodes with no label attribute, "/" is used as last label argument by default. - For matching session-routing rules at init's configuration, the matching of full labels should be replaced by 'label_prefix' matches, excluding the last (path) argument. - Wherever a label of a file-system session is rewritten by using init's 'label' attribute of a <parent> or <child> target node, the new attribute 'identity' should be used instead. This replaces the identity part of the label while preserving the client's directory argument. - Analogously to the matching of session-routing rules, server-side policy-selection rules that formerly matched a concrete 'label' must be changed to match a 'label_prefix' instead. As a good practice, 'label_prefix' values should end with " ->" if possible, which clearly delimits the identity part of the label used by the matching. Issue #5445
110 lines
2.9 KiB
C++
110 lines
2.9 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 and client-preferred root directory
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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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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("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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