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