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