149 lines
3.2 KiB
C++
149 lines
3.2 KiB
C++
/*
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* \brief File-system node
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* \author Norman Feske
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* \date 2012-04-11
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*/
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/*
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* Copyright (C) 2012-2017 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__RAM_FS__NODE_H_
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#define _INCLUDE__RAM_FS__NODE_H_
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/* Genode includes */
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#include <file_system/listener.h>
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#include <file_system/node.h>
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#include <util/list.h>
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namespace Ram_fs {
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using namespace Genode;
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using File_system::seek_off_t;
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using File_system::Status;
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using File_system::Timestamp;
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class Node;
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class File;
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class Symlink;
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enum class Session_writeable { READ_ONLY, WRITEABLE };
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}
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class Ram_fs::Node : public File_system::Node_base,
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private Weak_object<Node>,
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private List<Node>::Element
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{
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public:
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typedef char Name[128];
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using List<Node>::Element::next;
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using Weak_object<Node>::weak_ptr;
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private:
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friend class List<Node>;
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friend class Locked_ptr<Node>;
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int _ref_count;
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Name _name;
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unsigned long const _inode;
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Timestamp _modification_time { };
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/**
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* Generate unique inode number
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*/
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static unsigned long _unique_inode()
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{
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static unsigned long inode_count;
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return ++inode_count;
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}
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public:
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Node()
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: _ref_count(0), _inode(_unique_inode())
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{
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_name[0] = 0;
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_modification_time.value = File_system::Timestamp::INVALID;
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}
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virtual ~Node() { lock_for_destruction(); }
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unsigned long inode() const { return _inode; }
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char const *name() const { return _name; }
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/**
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* Assign name
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*/
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void name(char const *name) { strncpy(_name, name, sizeof(_name)); }
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void update_modification_time(Timestamp const time)
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{
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_modification_time = time;
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}
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Timestamp modification_time() const { return _modification_time; }
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/*
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* 'Session_writeable' is supplied to the 'read' method to reflect the
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* writeability in directory entries read from 'Directory' nodes.
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*/
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virtual size_t read(char *dst, size_t len, seek_off_t, Session_writeable) = 0;
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virtual size_t write(char const *src, size_t len, seek_off_t) = 0;
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virtual Status status(Session_writeable) = 0;
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/* File functionality */
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virtual void truncate(File_system::file_size_t)
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{
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Genode::error(__PRETTY_FUNCTION__, " called on a non-file node");
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}
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/* Directory functionality */
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virtual bool has_sub_node_unsynchronized(char const *) const
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{
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Genode::error(__PRETTY_FUNCTION__, " called on a non-directory node");
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return false;
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}
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virtual void adopt_unsynchronized(Node *)
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{
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Genode::error(__PRETTY_FUNCTION__, " called on a non-directory node");
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}
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virtual File *lookup_file(char const *)
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{
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Genode::error(__PRETTY_FUNCTION__, " called on a non-directory node");
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return nullptr;
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}
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virtual Symlink *lookup_symlink(char const *)
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{
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Genode::error(__PRETTY_FUNCTION__, " called on a non-directory node");
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return nullptr;
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}
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virtual Node *lookup(char const *, bool = false)
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{
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Genode::error(__PRETTY_FUNCTION__, " called on a non-directory node");
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return nullptr;
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}
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virtual void discard(Node *)
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{
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Genode::error(__PRETTY_FUNCTION__, " called on a non-directory node");
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}
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};
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#endif /* _INCLUDE__RAM_FS__NODE_H_ */
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