blob: 85341e753f8c9e19288ce608efa8973f78ab8918 [file] [log] [blame]
Daniel Campello819e2032015-07-20 16:23:50 -07001/*
2 * fs/sdcardfs/multiuser.h
3 *
4 * Copyright (c) 2013 Samsung Electronics Co. Ltd
5 * Authors: Daeho Jeong, Woojoong Lee, Seunghwan Hyun,
6 * Sunghwan Yun, Sungjong Seo
7 *
8 * This program has been developed as a stackable file system based on
9 * the WrapFS which written by
10 *
11 * Copyright (c) 1998-2011 Erez Zadok
12 * Copyright (c) 2009 Shrikar Archak
13 * Copyright (c) 2003-2011 Stony Brook University
14 * Copyright (c) 2003-2011 The Research Foundation of SUNY
15 *
16 * This file is dual licensed. It may be redistributed and/or modified
17 * under the terms of the Apache 2.0 License OR version 2 of the GNU
18 * General Public License.
19 */
20
Daniel Rosenberg0edc9bf2017-01-25 13:48:45 -080021#define AID_USER_OFFSET 100000 /* offset for uid ranges for each user */
22#define AID_APP_START 10000 /* first app user */
23#define AID_APP_END 19999 /* last app user */
24#define AID_CACHE_GID_START 20000 /* start of gids for apps to mark cached data */
25#define AID_EXT_GID_START 30000 /* start of gids for apps to mark external data */
Daniel Rosenberg56866352017-04-17 17:11:38 -070026#define AID_EXT_CACHE_GID_START 40000 /* start of gids for apps to mark external cached data */
27#define AID_EXT_CACHE_GID_END 49999 /* end of gids for apps to mark external cached data */
Daniel Rosenberg0edc9bf2017-01-25 13:48:45 -080028#define AID_SHARED_GID_START 50000 /* start of gids for apps in each user to share */
Daniel Campello819e2032015-07-20 16:23:50 -070029
30typedef uid_t userid_t;
31typedef uid_t appid_t;
32
Daniel Rosenberg0edc9bf2017-01-25 13:48:45 -080033static inline uid_t multiuser_get_uid(userid_t user_id, appid_t app_id)
34{
35 return (user_id * AID_USER_OFFSET) + (app_id % AID_USER_OFFSET);
Daniel Campello819e2032015-07-20 16:23:50 -070036}
37
Daniel Rosenberg70472b22017-04-24 16:11:03 -070038static inline bool uid_is_app(uid_t uid)
39{
40 appid_t appid = uid % AID_USER_OFFSET;
41
42 return appid >= AID_APP_START && appid <= AID_APP_END;
43}
44
Daniel Rosenberg56866352017-04-17 17:11:38 -070045static inline gid_t multiuser_get_ext_cache_gid(uid_t uid)
Daniel Rosenberg0edc9bf2017-01-25 13:48:45 -080046{
Daniel Rosenberg56866352017-04-17 17:11:38 -070047 return uid - AID_APP_START + AID_EXT_CACHE_GID_START;
Daniel Campello819e2032015-07-20 16:23:50 -070048}
49
Daniel Rosenbergd4299b02017-03-13 15:34:03 -070050static inline gid_t multiuser_get_ext_gid(uid_t uid)
Daniel Rosenberg0edc9bf2017-01-25 13:48:45 -080051{
Daniel Rosenbergd4299b02017-03-13 15:34:03 -070052 return uid - AID_APP_START + AID_EXT_GID_START;
Daniel Campello819e2032015-07-20 16:23:50 -070053}