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/refcount.h> 8 #include <linux/ratelimit.h> 9 10 struct key; 11 12 /* 13 * Some day this will be a full-fledged user tracking system.. 14 */ 15 struct user_struct { 16 refcount_t __count; /* reference count */ 17 atomic_t processes; /* How many processes does this user have? */ 18 atomic_t sigpending; /* How many pending signals does this user have? */ 19 #ifdef CONFIG_FANOTIFY 20 atomic_t fanotify_listeners; 21 #endif 22 #ifdef CONFIG_EPOLL 23 atomic_long_t epoll_watches; /* The number of file descriptors currently watched */ 24 #endif 25 #ifdef CONFIG_POSIX_MQUEUE 26 /* protected by mq_lock */ 27 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 28 #endif 29 unsigned long locked_shm; /* How many pages of mlocked shm ? */ 30 unsigned long unix_inflight; /* How many files in flight in unix sockets */ 31 atomic_long_t pipe_bufs; /* how many pages are allocated in pipe buffers */ 32 33 #ifdef CONFIG_KEYS 34 struct key *uid_keyring; /* UID specific keyring */ 35 struct key *session_keyring; /* UID's default session keyring */ 36 #endif 37 38 /* Hash table maintenance information */ 39 struct hlist_node uidhash_node; 40 kuid_t uid; 41 42 #if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL) || \ 43 defined(CONFIG_NET) 44 atomic_long_t locked_vm; 45 #endif 46 47 /* Miscellaneous per-user rate limit */ 48 struct ratelimit_state ratelimit; 49 }; 50 51 extern int uids_sysfs_init(void); 52 53 extern struct user_struct *find_user(kuid_t); 54 55 extern struct user_struct root_user; 56 #define INIT_USER (&root_user) 57 58 59 /* per-UID process charging. */ 60 extern struct user_struct * alloc_uid(kuid_t); get_uid(struct user_struct * u)61static inline struct user_struct *get_uid(struct user_struct *u) 62 { 63 refcount_inc(&u->__count); 64 return u; 65 } 66 extern void free_uid(struct user_struct *); 67 68 #endif /* _LINUX_SCHED_USER_H */ 69