LXR linux/include/linux/sched/user.h

   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 */
  56