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