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 */
14 struct 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) || IS_ENABLED(CONFIG_IOMMUFD)
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
39 extern int uids_sysfs_init(void);
40
41 extern struct user_struct *find_user(kuid_t);
42
43 extern struct user_struct root_user;
44 #define INIT_USER (&root_user)
45
46
47 /* per-UID process charging. */
48 extern struct user_struct * alloc_uid(kuid_t);
49 static inline struct user_struct *get_uid(struct user_struct *u)
50 {
51 refcount_inc(&u->__count);
52 return u;
53 }
54 extern void free_uid(struct user_struct *);
55
56 #endif /* _LINUX_SCHED_USER_H */
57
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