1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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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(r: &u->__count); |
52 | return u; |
53 | } |
54 | extern void free_uid(struct user_struct *); |
55 | |
56 | #endif /* _LINUX_SCHED_USER_H */ |
57 |