1 /* 2 * An access map providing memory corresponding to file regions. 3 * 4 * Copyright (C) 2021 Paul Boddie <paul@boddie.org.uk> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation; either version 2 of 9 * the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, 19 * Boston, MA 02110-1301, USA 20 */ 21 22 #pragma once 23 24 #include <mem/flexpage.h> 25 #include <fsserver/page_owner.h> 26 #include <fsserver/pages.h> 27 28 #include <map> 29 #include <mutex> 30 31 32 33 /* Collection types. */ 34 35 typedef std::map<offset_t, Flexpage *> _AccessMap; 36 typedef std::pair<offset_t, Flexpage *> _AccessMapEntry; 37 38 39 40 /* A mapping from file positions to flexpages. */ 41 42 class AccessMap 43 { 44 protected: 45 _AccessMap _flexpages; 46 std::mutex _lock; 47 48 public: 49 Flexpage *find(offset_t position); 50 51 void insert(Flexpage *flexpage); 52 53 bool remove(PageOwner *owner, Flexpage *flexpage); 54 55 void purge(PageOwner *owner, Pages *pages); 56 57 void flush_all(offset_t start, offset_t size, PageOwner *owner, Pages *pages); 58 }; 59 60 // vim: tabstop=4 expandtab shiftwidth=4