Linux kernel mirror (for testing)
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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 */
13struct 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_EPOLL
18 atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
19#endif
20#ifdef CONFIG_POSIX_MQUEUE
21 /* protected by mq_lock */
22 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
23#endif
24 unsigned long locked_shm; /* How many pages of mlocked shm ? */
25 unsigned long unix_inflight; /* How many files in flight in unix sockets */
26 atomic_long_t pipe_bufs; /* how many pages are allocated in pipe buffers */
27
28 /* Hash table maintenance information */
29 struct hlist_node uidhash_node;
30 kuid_t uid;
31
32#if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL) || \
33 defined(CONFIG_NET) || defined(CONFIG_IO_URING)
34 atomic_long_t locked_vm;
35#endif
36#ifdef CONFIG_WATCH_QUEUE
37 atomic_t nr_watches; /* The number of watches this user currently has */
38#endif
39
40 /* Miscellaneous per-user rate limit */
41 struct ratelimit_state ratelimit;
42};
43
44extern int uids_sysfs_init(void);
45
46extern struct user_struct *find_user(kuid_t);
47
48extern struct user_struct root_user;
49#define INIT_USER (&root_user)
50
51
52/* per-UID process charging. */
53extern struct user_struct * alloc_uid(kuid_t);
54static inline struct user_struct *get_uid(struct user_struct *u)
55{
56 refcount_inc(&u->__count);
57 return u;
58}
59extern void free_uid(struct user_struct *);
60
61#endif /* _LINUX_SCHED_USER_H */