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) || 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 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