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 defined(CONFIG_VFIO_PCI_ZDEV_KVM)
29 atomic_long_t locked_vm;
30#endif
31#ifdef CONFIG_WATCH_QUEUE
32 atomic_t nr_watches; /* The number of watches this user currently has */
33#endif
34
35 /* Miscellaneous per-user rate limit */
36 struct ratelimit_state ratelimit;
37};
38
39extern int uids_sysfs_init(void);
40
41extern struct user_struct *find_user(kuid_t);
42
43extern struct user_struct root_user;
44#define INIT_USER (&root_user)
45
46
47/* per-UID process charging. */
48extern struct user_struct * alloc_uid(kuid_t);
49static inline struct user_struct *get_uid(struct user_struct *u)
50{
51 refcount_inc(&u->__count);
52 return u;
53}
54extern void free_uid(struct user_struct *);
55
56#endif /* _LINUX_SCHED_USER_H */
57

source code of linux/include/linux/sched/user.h