38 lines
1.2 KiB
C
38 lines
1.2 KiB
C
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/*
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* fs/sdcardfs/multiuser.h
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*
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* Copyright (c) 2013 Samsung Electronics Co. Ltd
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* Authors: Daeho Jeong, Woojoong Lee, Seunghwan Hyun,
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* Sunghwan Yun, Sungjong Seo
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*
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* This program has been developed as a stackable file system based on
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* the WrapFS which written by
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*
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* Copyright (c) 1998-2011 Erez Zadok
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* Copyright (c) 2009 Shrikar Archak
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* Copyright (c) 2003-2011 Stony Brook University
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* Copyright (c) 2003-2011 The Research Foundation of SUNY
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*
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* This file is dual licensed. It may be redistributed and/or modified
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* under the terms of the Apache 2.0 License OR version 2 of the GNU
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* General Public License.
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*/
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#define MULTIUSER_APP_PER_USER_RANGE 100000
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typedef uid_t userid_t;
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typedef uid_t appid_t;
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static inline userid_t multiuser_get_user_id(uid_t uid) {
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return uid / MULTIUSER_APP_PER_USER_RANGE;
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}
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static inline appid_t multiuser_get_app_id(uid_t uid) {
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return uid % MULTIUSER_APP_PER_USER_RANGE;
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}
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static inline uid_t multiuser_get_uid(userid_t userId, appid_t appId) {
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return userId * MULTIUSER_APP_PER_USER_RANGE + (appId % MULTIUSER_APP_PER_USER_RANGE);
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}
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