include/linux/sched/user.h

   1 #ifndef _LINUX_SCHED_USER_H
   2 #define _LINUX_SCHED_USER_H
   3
   4 #include <linux/uidgid.h>
   5 #include <linux/atomic.h>
   6
   7 struct key;
   8
   9 /*
  10  * Some day this will be a full-fledged user tracking system..
  11  */
  12 struct user_struct {
  13         atomic_t __count;       /* reference count */
  14         atomic_t processes;     /* How many processes does this user have? */
  15         atomic_t sigpending;    /* How many pending signals does this user have? */
  16 #ifdef CONFIG_FANOTIFY
  17         atomic_t fanotify_listeners;
  18 #endif
  19 #ifdef CONFIG_EPOLL
  20         atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
  21 #endif
  22 #ifdef CONFIG_POSIX_MQUEUE
  23         /* protected by mq_lock */
  24         unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
  25 #endif
  26         unsigned long locked_shm; /* How many pages of mlocked shm ? */
  27         unsigned long unix_inflight;    /* How many files in flight in unix sockets */
  28         atomic_long_t pipe_bufs;  /* how many pages are allocated in pipe buffers */
  29
  30 #ifdef CONFIG_KEYS
  31         struct key *uid_keyring;        /* UID specific keyring */
  32         struct key *session_keyring;    /* UID's default session keyring */
  33 #endif
  34
  35         /* Hash table maintenance information */
  36         struct hlist_node uidhash_node;
  37         kuid_t uid;
  38
  39 #if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL)
  40         atomic_long_t locked_vm;
  41 #endif
  42 };
  43
  44 extern int uids_sysfs_init(void);
  45
  46 extern struct user_struct *find_user(kuid_t);
  47
  48 extern struct user_struct root_user;
  49 #define INIT_USER (&root_user)
  50
  51
  52 /* per-UID process charging. */
  53 extern struct user_struct * alloc_uid(kuid_t);
  54 static inline struct user_struct *get_uid(struct user_struct *u)
  55 {
  56         atomic_inc(&u->__count);
  57         return u;
  58 }
  59 extern void free_uid(struct user_struct *);
  60
  61 #endif /* _LINUX_SCHED_USER_H */