Line data    Source code

       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/refcount.h>
       8             : #include <linux/ratelimit.h>
       9             : 
      10             : /*
      11             :  * Some day this will be a full-fledged user tracking system..
      12             :  */
      13             : struct user_struct {
      14             :         refcount_t __count;     /* reference count */
      15             :         atomic_t processes;     /* How many processes does this user have? */
      16             :         atomic_t sigpending;    /* How many pending signals does this user have? */
      17             : #ifdef CONFIG_FANOTIFY
      18             :         atomic_t fanotify_listeners;
      19             : #endif
      20             : #ifdef CONFIG_EPOLL
      21             :         atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
      22             : #endif
      23             : #ifdef CONFIG_POSIX_MQUEUE
      24             :         /* protected by mq_lock */
      25             :         unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
      26             : #endif
      27             :         unsigned long locked_shm; /* How many pages of mlocked shm ? */
      28             :         unsigned long unix_inflight;    /* How many files in flight in unix sockets */
      29             :         atomic_long_t pipe_bufs;  /* how many pages are allocated in pipe buffers */
      30             : 
      31             :         /* Hash table maintenance information */
      32             :         struct hlist_node uidhash_node;
      33             :         kuid_t uid;
      34             : 
      35             : #if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL) || \
      36             :     defined(CONFIG_NET) || defined(CONFIG_IO_URING)
      37             :         atomic_long_t locked_vm;
      38             : #endif
      39             : #ifdef CONFIG_WATCH_QUEUE
      40             :         atomic_t nr_watches;    /* The number of watches this user currently has */
      41             : #endif
      42             : 
      43             :         /* Miscellaneous per-user rate limit */
      44             :         struct ratelimit_state ratelimit;
      45             : };
      46             : 
      47             : extern int uids_sysfs_init(void);
      48             : 
      49             : extern struct user_struct *find_user(kuid_t);
      50             : 
      51             : extern struct user_struct root_user;
      52             : #define INIT_USER (&root_user)
      53             : 
      54             : 
      55             : /* per-UID process charging. */
      56             : extern struct user_struct * alloc_uid(kuid_t);
      57        7149 : static inline struct user_struct *get_uid(struct user_struct *u)
      58             : {
      59        7149 :         refcount_inc(&u->__count);
      60        7149 :         return u;
      61             : }
      62             : extern void free_uid(struct user_struct *);
      63             : 
      64             : #endif /* _LINUX_SCHED_USER_H */