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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 */ | |
26 | #define AID_SHARED_GID_START 50000 /* start of gids for apps in each user to share */ | |
ee184c81 DC |
27 | |
28 | typedef uid_t userid_t; | |
29 | typedef uid_t appid_t; | |
30 | ||
f4d33b9a DR |
31 | static inline uid_t multiuser_get_uid(userid_t user_id, appid_t app_id) { |
32 | return (user_id * AID_USER_OFFSET) + (app_id % AID_USER_OFFSET); | |
ee184c81 DC |
33 | } |
34 | ||
f4d33b9a DR |
35 | static inline gid_t multiuser_get_cache_gid(userid_t user_id, appid_t app_id) { |
36 | if (app_id >= AID_APP_START && app_id <= AID_APP_END) { | |
37 | return multiuser_get_uid(user_id, (app_id - AID_APP_START) + AID_CACHE_GID_START); | |
38 | } else { | |
39 | return -1; | |
40 | } | |
ee184c81 DC |
41 | } |
42 | ||
f4d33b9a DR |
43 | static inline gid_t multiuser_get_ext_gid(userid_t user_id, appid_t app_id) { |
44 | if (app_id >= AID_APP_START && app_id <= AID_APP_END) { | |
45 | return multiuser_get_uid(user_id, (app_id - AID_APP_START) + AID_EXT_GID_START); | |
46 | } else { | |
47 | return -1; | |
48 | } | |
ee184c81 | 49 | } |