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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)57 static 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