75 lines
1.3 KiB
C++
75 lines
1.3 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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#ifndef _NODE_H_
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#define _NODE_H_
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/* Genode includes */
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#include <util/list.h>
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#include <base/lock.h>
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namespace File_system {
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class Node : public List<Node>::Element
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{
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public:
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typedef char Name[128];
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private:
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Lock _lock;
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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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/**
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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() : _ref_count(0), _inode(_unique_inode()) { _name[0] = 0; }
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virtual ~Node() { }
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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 lock() { _lock.lock(); }
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void unlock() { _lock.unlock(); }
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virtual size_t read(char *dst, size_t len, seek_off_t) = 0;
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virtual size_t write(char const *src, size_t len, seek_off_t) = 0;
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};
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/**
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* Guard used for properly releasing node locks
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*/
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struct Node_lock_guard
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{
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Node &node;
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Node_lock_guard(Node &node) : node(node) { }
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~Node_lock_guard() { node.unlock(); }
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};
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}
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#endif /* _NODE_H_ */
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