user.h (1497B)
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 */