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ee184c81 DC |
1 | /* |
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 | ||
f4d33b9a DR |
21 | #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 */ | |
0823af9f DR |
26 | #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 */ | |
f4d33b9a | 28 | #define AID_SHARED_GID_START 50000 /* start of gids for apps in each user to share */ |
ee184c81 DC |
29 | |
30 | typedef uid_t userid_t; | |
31 | typedef uid_t appid_t; | |
32 | ||
e1211368 DR |
33 | static inline uid_t multiuser_get_uid(userid_t user_id, appid_t app_id) |
34 | { | |
cdd083aa | 35 | return (user_id * AID_USER_OFFSET) + (app_id % AID_USER_OFFSET); |
ee184c81 DC |
36 | } |
37 | ||
b837bbcd DR |
38 | static 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 | ||
0823af9f | 45 | static inline gid_t multiuser_get_ext_cache_gid(uid_t uid) |
e1211368 | 46 | { |
0823af9f | 47 | return uid - AID_APP_START + AID_EXT_CACHE_GID_START; |
ee184c81 DC |
48 | } |
49 | ||
e1211368 DR |
50 | static inline gid_t multiuser_get_ext_gid(uid_t uid) |
51 | { | |
76856013 | 52 | return uid - AID_APP_START + AID_EXT_GID_START; |
ee184c81 | 53 | } |