1 /* 2 * An opener for a file provided by an Ext2-compatible filesystem. 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 <ext2fs/ext2fs.h> 25 26 #include <fsclient/file.h> 27 #include <fsserver/ext2_file_operations.h> 28 #include <fsserver/opener_resource.h> 29 #include <systypes/user.h> 30 31 32 33 /* Forward declarations. */ 34 35 struct Ext2FileOpenerDir; 36 37 38 39 /* Support for providing access to files. */ 40 41 class Ext2FileOpener : public OpenerResource 42 { 43 protected: 44 Ext2FileOperations *_ops; 45 user_t _user; 46 47 /* Convenience methods determining different object types. */ 48 49 virtual bool accessing_directory(const char *path, flags_t flags, fileid_t fileid); 50 51 virtual bool accessing_file(const char *path, flags_t flags, fileid_t fileid); 52 53 /* Convenience methods obtaining different pager types. */ 54 55 virtual long get_directory(const char *path, flags_t flags, fileid_t fileid, 56 offset_t *size, l4_cap_idx_t *cap, 57 object_flags_t *object_flags); 58 59 public: 60 explicit Ext2FileOpener(FilePaging *paging, Ext2FileOperations *ops, user_t user) 61 : OpenerResource(paging), _ops(ops), _user(user) 62 { 63 } 64 65 virtual ~Ext2FileOpener(); 66 67 /* Configurable methods. */ 68 69 virtual long get_fileid(const char *path, flags_t flags, fileid_t *fileid); 70 71 virtual long make_accessor(const char *path, flags_t flags, fileid_t fileid, Accessor **accessor); 72 73 /* Helper methods. */ 74 75 void read_directory(fileid_t fileid, file_t *writer); 76 77 int write_directory_entry(struct Ext2FileOpenerDir *dir); 78 }; 79 80 81 82 /* Helper structures. */ 83 84 struct Ext2FileOpenerDir 85 { 86 Ext2FileOpener *opener; 87 file_t *writer; 88 struct ext2_dir_entry *entry; 89 long offset; 90 }; 91 92 // vim: tabstop=4 expandtab shiftwidth=4