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  */
  14 struct 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
  39 extern int uids_sysfs_init(void);
  40
  41 extern struct user_struct *find_user(kuid_t);
  42
  43 extern struct user_struct root_user;
  44 #define INIT_USER (&root_user)
  45
  46
  47 /* per-UID process charging. */
  48 extern struct user_struct * alloc_uid(kuid_t);
  49 static inline struct user_struct *get_uid(struct user_struct *u)
  50 {
  51         refcount_inc(&u->__count);
  52         return u;
  53 }
  54 extern void free_uid(struct user_struct *);
  55
  56 #endif /* _LINUX_SCHED_USER_H */