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
10struct key;
11
12/*
13 * Some day this will be a full-fledged user tracking system..
14 */
15struct user_struct {
16 refcount_t __count; /* reference count */
17 atomic_t processes; /* How many processes does this user have? */
18 atomic_t sigpending; /* How many pending signals does this user have? */
19#ifdef CONFIG_FANOTIFY
20 atomic_t fanotify_listeners;
21#endif
22#ifdef CONFIG_EPOLL
23 atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
24#endif
25#ifdef CONFIG_POSIX_MQUEUE
26 /* protected by mq_lock */
27 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
28#endif
29 unsigned long locked_shm; /* How many pages of mlocked shm ? */
30 unsigned long unix_inflight; /* How many files in flight in unix sockets */
31 atomic_long_t pipe_bufs; /* how many pages are allocated in pipe buffers */
32
33#ifdef CONFIG_KEYS
34 /*
35 * These pointers can only change from NULL to a non-NULL value once.
36 * Writes are protected by key_user_keyring_mutex.
37 * Unlocked readers should use READ_ONCE() unless they know that
38 * install_user_keyrings() has been called successfully (which sets
39 * these members to non-NULL values, preventing further modifications).
40 */
41 struct key *uid_keyring; /* UID specific keyring */
42 struct key *session_keyring; /* UID's default session keyring */
43#endif
44
45 /* Hash table maintenance information */
46 struct hlist_node uidhash_node;
47 kuid_t uid;
48
49#if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL) || \
50 defined(CONFIG_NET) || defined(CONFIG_IO_URING)
51 atomic_long_t locked_vm;
52#endif
53
54 /* Miscellaneous per-user rate limit */
55 struct ratelimit_state ratelimit;
56};
57
58extern int uids_sysfs_init(void);
59
60extern struct user_struct *find_user(kuid_t);
61
62extern struct user_struct root_user;
63#define INIT_USER (&root_user)
64
65
66/* per-UID process charging. */
67extern struct user_struct * alloc_uid(kuid_t);
68static inline struct user_struct *get_uid(struct user_struct *u)
69{
70 refcount_inc(&u->__count);
71 return u;
72}
73extern void free_uid(struct user_struct *);
74
75#endif /* _LINUX_SCHED_USER_H */