| paul@93 | 1 | /* |
| paul@224 | 2 | * Filesystem resource registry incorporating opening functionality. |
| paul@93 | 3 | * |
| paul@93 | 4 | * Copyright (C) 2021 Paul Boddie <paul@boddie.org.uk> |
| paul@93 | 5 | * |
| paul@93 | 6 | * This program is free software; you can redistribute it and/or |
| paul@93 | 7 | * modify it under the terms of the GNU General Public License as |
| paul@93 | 8 | * published by the Free Software Foundation; either version 2 of |
| paul@93 | 9 | * the License, or (at your option) any later version. |
| paul@93 | 10 | * |
| paul@93 | 11 | * This program is distributed in the hope that it will be useful, |
| paul@93 | 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| paul@93 | 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| paul@93 | 14 | * GNU General Public License for more details. |
| paul@93 | 15 | * |
| paul@93 | 16 | * You should have received a copy of the GNU General Public License |
| paul@93 | 17 | * along with this program; if not, write to the Free Software |
| paul@93 | 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| paul@93 | 19 | * Boston, MA 02110-1301, USA |
| paul@93 | 20 | */ |
| paul@93 | 21 | |
| paul@202 | 22 | #include "directory_resource.h" |
| paul@79 | 23 | #include "file_pager.h" |
| paul@224 | 24 | #include "resource_registry.h" |
| paul@9 | 25 | |
| paul@85 | 26 | #include <systypes/fcntl.h> |
| paul@85 | 27 | |
| paul@79 | 28 | |
| paul@79 | 29 | |
| paul@209 | 30 | /* The file object registry provides a memory page collection to the page |
| paul@200 | 31 | mappers it creates. */ |
| paul@200 | 32 | |
| paul@224 | 33 | ResourceRegistry::ResourceRegistry(Pages *pages) |
| paul@200 | 34 | : _pages(pages) |
| paul@94 | 35 | { |
| paul@94 | 36 | } |
| paul@94 | 37 | |
| paul@85 | 38 | |
| paul@85 | 39 | |
| paul@87 | 40 | /* Convert opening flags to map-compatible paging flags. */ |
| paul@85 | 41 | |
| paul@224 | 42 | map_flags_t ResourceRegistry::get_flags(flags_t flags) |
| paul@85 | 43 | { |
| paul@87 | 44 | return flags & (O_WRONLY | O_RDWR) ? L4RE_DS_MAP_FLAG_RW : L4RE_DS_MAP_FLAG_RO; |
| paul@85 | 45 | } |
| paul@85 | 46 | |
| paul@85 | 47 | |
| paul@85 | 48 | |
| paul@220 | 49 | /* Make a directory provider. */ |
| paul@202 | 50 | |
| paul@224 | 51 | long ResourceRegistry::make_directory_provider(FileOpening *opening, |
| paul@224 | 52 | const char *path, flags_t flags, |
| paul@224 | 53 | fileid_t fileid, |
| paul@224 | 54 | Provider **provider) |
| paul@208 | 55 | { |
| paul@202 | 56 | /* Make an accessor and a provider to encapsulate it. */ |
| paul@202 | 57 | |
| paul@202 | 58 | DirectoryAccessor *accessor; |
| paul@220 | 59 | long err = opening->make_directory_accessor(path, flags, fileid, &accessor); |
| paul@202 | 60 | |
| paul@202 | 61 | if (err) |
| paul@202 | 62 | return err; |
| paul@202 | 63 | |
| paul@221 | 64 | *provider = new DirectoryProvider(fileid, this, accessor); |
| paul@202 | 65 | return L4_EOK; |
| paul@202 | 66 | } |
| paul@202 | 67 | |
| paul@220 | 68 | /* Make a file provider. */ |
| paul@202 | 69 | |
| paul@224 | 70 | long ResourceRegistry::make_file_provider(FileOpening *opening, |
| paul@224 | 71 | const char *path, flags_t flags, |
| paul@224 | 72 | fileid_t fileid, |
| paul@224 | 73 | Provider **provider) |
| paul@220 | 74 | { |
| paul@200 | 75 | /* Make an accessor, page mapper, and a provider to encapsulate them. */ |
| paul@79 | 76 | |
| paul@143 | 77 | Accessor *accessor; |
| paul@144 | 78 | long err = opening->make_accessor(path, flags, fileid, &accessor); |
| paul@106 | 79 | |
| paul@143 | 80 | if (err) |
| paul@143 | 81 | return err; |
| paul@106 | 82 | |
| paul@200 | 83 | PageMapper *mapper = new PageMapper(accessor, _pages); |
| paul@221 | 84 | *provider = new FileProvider(fileid, get_flags(flags), this, mapper); |
| paul@143 | 85 | return L4_EOK; |
| paul@79 | 86 | } |
| paul@79 | 87 | |
| paul@220 | 88 | /* Make a provider of the appropriate type. */ |
| paul@220 | 89 | |
| paul@224 | 90 | long ResourceRegistry::make_provider(FileOpening *opening, |
| paul@224 | 91 | const char *path, flags_t flags, |
| paul@224 | 92 | fileid_t fileid, |
| paul@224 | 93 | Provider **provider) |
| paul@220 | 94 | { |
| paul@223 | 95 | long err = -L4_EIO; |
| paul@223 | 96 | |
| paul@220 | 97 | if (opening->accessing_directory(path, flags, fileid)) |
| paul@223 | 98 | err = make_directory_provider(opening, path, flags, fileid, provider); |
| paul@220 | 99 | else if (opening->accessing_file(path, flags, fileid)) |
| paul@223 | 100 | err = make_file_provider(opening, path, flags, fileid, provider); |
| paul@223 | 101 | |
| paul@223 | 102 | if (err) |
| paul@223 | 103 | return err; |
| paul@223 | 104 | |
| paul@223 | 105 | /* Register the provider. */ |
| paul@223 | 106 | |
| paul@223 | 107 | set(fileid, *provider); |
| paul@223 | 108 | return L4_EOK; |
| paul@220 | 109 | } |
| paul@220 | 110 | |
| paul@79 | 111 | |
| paul@79 | 112 | |
| paul@224 | 113 | /* Obtain any active provider for the given 'fileid'. */ |
| paul@224 | 114 | |
| paul@224 | 115 | long ResourceRegistry::find_provider(fileid_t fileid, Provider **provider) |
| paul@224 | 116 | { |
| paul@224 | 117 | /* Obtain any registered provider. */ |
| paul@224 | 118 | |
| paul@224 | 119 | Accountable *accountable = get(fileid); |
| paul@224 | 120 | |
| paul@224 | 121 | if (accountable != NULL) |
| paul@224 | 122 | { |
| paul@224 | 123 | *provider = dynamic_cast<Provider *>(accountable); |
| paul@224 | 124 | |
| paul@224 | 125 | if ((*provider) != NULL) |
| paul@224 | 126 | return L4_EOK; |
| paul@224 | 127 | else |
| paul@224 | 128 | return -L4_EIO; |
| paul@224 | 129 | } |
| paul@224 | 130 | |
| paul@224 | 131 | return -L4_ENOENT; |
| paul@224 | 132 | } |
| paul@224 | 133 | |
| paul@224 | 134 | |
| paul@224 | 135 | |
| paul@218 | 136 | /* Return a resource for a filesystem object. */ |
| paul@218 | 137 | |
| paul@224 | 138 | long ResourceRegistry::get_resource(FileOpening *opening, const char *path, |
| paul@224 | 139 | flags_t flags, offset_t *size, |
| paul@224 | 140 | object_flags_t *object_flags, |
| paul@224 | 141 | Resource **resource) |
| paul@218 | 142 | { |
| paul@218 | 143 | std::lock_guard<std::mutex> guard(_lock); |
| paul@218 | 144 | |
| paul@220 | 145 | /* Obtain an identifier for the object, even for new files (subject to use |
| paul@220 | 146 | of the appropriate flag). */ |
| paul@218 | 147 | |
| paul@218 | 148 | fileid_t fileid; |
| paul@218 | 149 | long err = opening->get_fileid(path, flags, &fileid); |
| paul@218 | 150 | |
| paul@218 | 151 | if (err) |
| paul@218 | 152 | return err; |
| paul@218 | 153 | |
| paul@220 | 154 | /* Obtain a provider for the object. */ |
| paul@220 | 155 | |
| paul@220 | 156 | Provider *provider; |
| paul@220 | 157 | err = find_provider(fileid, &provider); |
| paul@220 | 158 | |
| paul@220 | 159 | /* Make a new provider if necessary. */ |
| paul@220 | 160 | |
| paul@220 | 161 | if (err == -L4_ENOENT) |
| paul@220 | 162 | err = make_provider(opening, path, flags, fileid, &provider); |
| paul@220 | 163 | |
| paul@220 | 164 | if (err) |
| paul@220 | 165 | return err; |
| paul@220 | 166 | |
| paul@220 | 167 | /* Make a resource for the provider. */ |
| paul@220 | 168 | |
| paul@221 | 169 | return provider->make_resource(size, object_flags, resource); |
| paul@220 | 170 | } |
| paul@220 | 171 | |
| paul@9 | 172 | // vim: tabstop=4 expandtab shiftwidth=4 |
