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/ratelimit.h>
   8
   9 struct key;
  10
  11 /*
  12  * Some day this will be a full-fledged user tracking system..
  13  */
  14 struct user_struct {
  15         atomic_t __count;       /* reference count */
  16         atomic_t processes;     /* How many processes does this user have? */
  17         atomic_t sigpending;    /* How many pending signals does this user have? */
  18 #ifdef CONFIG_FANOTIFY
  19         atomic_t fanotify_listeners;
  20 #endif
  21 #ifdef CONFIG_EPOLL
  22         atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
  23 #endif
  24 #ifdef CONFIG_POSIX_MQUEUE
  25         /* protected by mq_lock */
  26         unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
  27 #endif
  28         unsigned long locked_shm; /* How many pages of mlocked shm ? */
  29         unsigned long unix_inflight;    /* How many files in flight in unix sockets */
  30         atomic_long_t pipe_bufs;  /* how many pages are allocated in pipe buffers */
  31
  32 #ifdef CONFIG_KEYS
  33         struct key *uid_keyring;        /* UID specific keyring */
  34         struct key *session_keyring;    /* UID's default session keyring */
  35 #endif
  36
  37         /* Hash table maintenance information */
  38         struct hlist_node uidhash_node;
  39         kuid_t uid;
  40
  41 #if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL) || \
  42     defined(CONFIG_NET)
  43         atomic_long_t locked_vm;
  44 #endif
  45
  46         /* Miscellaneous per-user rate limit */
  47         struct ratelimit_state ratelimit;
  48 };
  49
  50 extern int uids_sysfs_init(void);
  51
  52 extern struct user_struct *find_user(kuid_t);
  53
  54 extern struct user_struct root_user;
  55 #define INIT_USER (&root_user)
  56
  57
  58 /* per-UID process charging. */
  59 extern struct user_struct * alloc_uid(kuid_t);
  60 static inline struct user_struct *get_uid(struct user_struct *u)
  61 {
  62         atomic_inc(&u->__count);
  63         return u;
  64 }
  65 extern void free_uid(struct user_struct *);
  66
  67 #endif /* _LINUX_SCHED_USER_H */