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 /* 11 * Some day this will be a full-fledged user tracking system.. 12 */ 13 struct user_struct { 14 refcount_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 /* Hash table maintenance information */ 32 struct hlist_node uidhash_node; 33 kuid_t uid; 34 35 #if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL) || \ 36 defined(CONFIG_NET) || defined(CONFIG_IO_URING) 37 atomic_long_t locked_vm; 38 #endif 39 #ifdef CONFIG_WATCH_QUEUE 40 atomic_t nr_watches; /* The number of watches this user currently has */ 41 #endif 42 43 /* Miscellaneous per-user rate limit */ 44 struct ratelimit_state ratelimit; 45 }; 46 47 extern int uids_sysfs_init(void); 48 49 extern struct user_struct *find_user(kuid_t); 50 51 extern struct user_struct root_user; 52 #define INIT_USER (&root_user) 53 54 55 /* per-UID process charging. */ 56 extern struct user_struct * alloc_uid(kuid_t); get_uid(struct user_struct * u)57static inline struct user_struct *get_uid(struct user_struct *u) 58 { 59 refcount_inc(&u->__count); 60 return u; 61 } 62 extern void free_uid(struct user_struct *); 63 64 #endif /* _LINUX_SCHED_USER_H */ 65