Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2)  * fs/sdcardfs/multiuser.h
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * Copyright (c) 2013 Samsung Electronics Co. Ltd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *   Authors: Daeho Jeong, Woojoong Lee, Seunghwan Hyun,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *               Sunghwan Yun, Sungjong Seo
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * This program has been developed as a stackable file system based on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * the WrapFS which written by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * Copyright (c) 1998-2011 Erez Zadok
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * Copyright (c) 2009     Shrikar Archak
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  * Copyright (c) 2003-2011 Stony Brook University
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  * Copyright (c) 2003-2011 The Research Foundation of SUNY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  * This file is dual licensed.  It may be redistributed and/or modified
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  * under the terms of the Apache 2.0 License OR version 2 of the GNU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  * General Public License.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define AID_USER_OFFSET     100000 /* offset for uid ranges for each user */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define AID_APP_START        10000 /* first app user */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define AID_APP_END          19999 /* last app user */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define AID_CACHE_GID_START  20000 /* start of gids for apps to mark cached data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define AID_EXT_GID_START    30000 /* start of gids for apps to mark external data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define AID_EXT_CACHE_GID_START 40000 /* start of gids for apps to mark external cached data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define AID_EXT_CACHE_GID_END 49999   /* end of gids for apps to mark external cached data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define AID_SHARED_GID_START 50000 /* start of gids for apps in each user to share */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) typedef uid_t userid_t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) typedef uid_t appid_t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) static inline uid_t multiuser_get_uid(userid_t user_id, appid_t app_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	return (user_id * AID_USER_OFFSET) + (app_id % AID_USER_OFFSET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) static inline bool uid_is_app(uid_t uid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	appid_t appid = uid % AID_USER_OFFSET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	return appid >= AID_APP_START && appid <= AID_APP_END;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) static inline gid_t multiuser_get_ext_cache_gid(uid_t uid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	return uid - AID_APP_START + AID_EXT_CACHE_GID_START;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static inline gid_t multiuser_get_ext_gid(uid_t uid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	return uid - AID_APP_START + AID_EXT_GID_START;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }