1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_SCHED_USER_H 3 #define _LINUX_SCHED_USER_H 4 5 #include <linux/uidgid.h> 6 #include <linux/atomic.h> 7 #include <linux/ratelimit.h> 8 9 struct key; 10 11 /* 12 * Some day this will be a full-fledged user tracking system.. 13 */ 14 struct user_struct { 15 atomic_t __count; /* reference count */ 16 atomic_t processes; /* How many processes does this user have? */ 17 atomic_t sigpending; /* How many pending signals does this user have? */ 18 #ifdef CONFIG_FANOTIFY 19 atomic_t fanotify_listeners; 20 #endif 21 #ifdef CONFIG_EPOLL 22 atomic_long_t epoll_watches; /* The number of file descriptors currently watched */ 23 #endif 24 #ifdef CONFIG_POSIX_MQUEUE 25 /* protected by mq_lock */ 26 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 27 #endif 28 unsigned long locked_shm; /* How many pages of mlocked shm ? */ 29 unsigned long unix_inflight; /* How many files in flight in unix sockets */ 30 atomic_long_t pipe_bufs; /* how many pages are allocated in pipe buffers */ 31 32 #ifdef CONFIG_KEYS 33 struct key *uid_keyring; /* UID specific keyring */ 34 struct key *session_keyring; /* UID's default session keyring */ 35 #endif 36 37 /* Hash table maintenance information */ 38 struct hlist_node uidhash_node; 39 kuid_t uid; 40 41 #if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL) || \ 42 defined(CONFIG_NET) 43 atomic_long_t locked_vm; 44 #endif 45 46 /* Miscellaneous per-user rate limit */ 47 struct ratelimit_state ratelimit; 48 }; 49 50 extern int uids_sysfs_init(void); 51 52 extern struct user_struct *find_user(kuid_t); 53 54 extern struct user_struct root_user; 55 #define INIT_USER (&root_user) 56 57 58 /* per-UID process charging. */ 59 extern struct user_struct * alloc_uid(kuid_t); 60 static inline struct user_struct *get_uid(struct user_struct *u) 61 { 62 atomic_inc(&u->__count); 63 return u; 64 } 65 extern void free_uid(struct user_struct *); 66 67 #endif /* _LINUX_SCHED_USER_H */ 68