1 /* 2 * File-specific pager functionality. 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 <fsserver/mapped_file_object_interface.h> 25 #include <fsserver/pager.h> 26 #include <fsserver/file_provider.h> 27 28 29 30 /* A pager abstraction for a file. */ 31 32 class FilePager : public Pager, public MappedFileObject 33 { 34 protected: 35 FileProvider *_provider; 36 37 /* Notification endpoint for event subscription. */ 38 39 unsigned int _endpoint; 40 41 /* Resize flag for notification. */ 42 43 bool _resized = false; 44 45 public: 46 fileid_t fileid; 47 48 explicit FilePager(fileid_t fileid, FileProvider *provider, map_flags_t flags); 49 50 virtual void close(); 51 52 /* Server details. */ 53 54 int expected_items(); 55 56 ipc_server_handler_type handler(); 57 58 void *interface() 59 { return static_cast<MappedFileObject *>(this); } 60 61 /* File methods. */ 62 63 virtual long flush(offset_t populated_size, offset_t *size); 64 65 virtual long resize(offset_t *size); 66 67 /* Pager and mapped file methods. */ 68 69 virtual long map(offset_t offset, address_t hot_spot, map_flags_t flags, 70 l4_snd_fpage_t *region); 71 72 virtual long mmap(offset_t position, offset_t length, offset_t *start_pos, 73 offset_t *end_pos, offset_t *size); 74 75 /* Notification methods. */ 76 77 virtual long subscribe(l4_cap_idx_t endpoint, notify_flags_t flags); 78 79 virtual long unsubscribe(l4_cap_idx_t endpoint); 80 }; 81 82 // vim: tabstop=4 expandtab shiftwidth=4