7e5d0b1fae
To quickly answer the question of "how much data is a UID using?" we need a GID range to label files on external storage, similar to the GID ranges already defined for cached and shared data. Also define a new GID that will be used to label the OBB files shared between all users under /data/media/obb. Test: builds, newly added tests pass Bug: 34263266 Change-Id: I16fb7d166c3dcdeafbf477162d191d3b73ae8ac2
58 lines
1.9 KiB
C
58 lines
1.9 KiB
C
/*
|
|
* Copyright (C) 2012 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#include <cutils/multiuser.h>
|
|
#include <private/android_filesystem_config.h>
|
|
|
|
userid_t multiuser_get_user_id(uid_t uid) {
|
|
return uid / AID_USER_OFFSET;
|
|
}
|
|
|
|
appid_t multiuser_get_app_id(uid_t uid) {
|
|
return uid % AID_USER_OFFSET;
|
|
}
|
|
|
|
uid_t multiuser_get_uid(userid_t user_id, appid_t app_id) {
|
|
return (user_id * AID_USER_OFFSET) + (app_id % AID_USER_OFFSET);
|
|
}
|
|
|
|
gid_t multiuser_get_cache_gid(userid_t user_id, appid_t app_id) {
|
|
if (app_id >= AID_APP_START && app_id <= AID_APP_END) {
|
|
return multiuser_get_uid(user_id, (app_id - AID_APP_START) + AID_CACHE_GID_START);
|
|
} else {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
gid_t multiuser_get_ext_gid(userid_t user_id, appid_t app_id) {
|
|
if (app_id >= AID_APP_START && app_id <= AID_APP_END) {
|
|
return multiuser_get_uid(user_id, (app_id - AID_APP_START) + AID_EXT_GID_START);
|
|
} else {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
gid_t multiuser_get_shared_gid(userid_t user_id, appid_t app_id) {
|
|
if (app_id >= AID_APP_START && app_id <= AID_APP_END) {
|
|
return multiuser_get_uid(user_id, (app_id - AID_APP_START) + AID_SHARED_GID_START);
|
|
} else {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
gid_t multiuser_get_shared_app_gid(uid_t uid) {
|
|
return multiuser_get_shared_gid(multiuser_get_user_id(uid), multiuser_get_app_id(uid));
|
|
}
|