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/percpu_counter.h>
8#include <linux/refcount.h>
9#include <linux/ratelimit.h>
10
11/*
12 * Some day this will be a full-fledged user tracking system..
13 */
14struct user_struct {
15 refcount_t __count; /* reference count */
16#ifdef CONFIG_EPOLL
17 struct percpu_counter epoll_watches; /* The number of file descriptors currently watched */
18#endif
19 unsigned long unix_inflight; /* How many files in flight in unix sockets */
20 atomic_long_t pipe_bufs; /* how many pages are allocated in pipe buffers */
21
22 /* Hash table maintenance information */
23 struct hlist_node uidhash_node;
24 kuid_t uid;
25
26#if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL) || \
27 defined(CONFIG_NET) || defined(CONFIG_IO_URING)
28 atomic_long_t locked_vm;
29#endif
30#ifdef CONFIG_WATCH_QUEUE
31 atomic_t nr_watches; /* The number of watches this user currently has */
32#endif
33
34 /* Miscellaneous per-user rate limit */
35 struct ratelimit_state ratelimit;
36};
37
38extern int uids_sysfs_init(void);
39
40extern struct user_struct *find_user(kuid_t);
41
42extern struct user_struct root_user;
43#define INIT_USER (&root_user)
44
45
46/* per-UID process charging. */
47extern struct user_struct * alloc_uid(kuid_t);
48static inline struct user_struct *get_uid(struct user_struct *u)
49{
50 refcount_inc(&u->__count);
51 return u;
52}
53extern void free_uid(struct user_struct *);
54
55#endif /* _LINUX_SCHED_USER_H */