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/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         680 :         refcount_inc(&u->__count);
      52             :         return u;
      53             : }
      54             : extern void free_uid(struct user_struct *);
      55             : 
      56             : #endif /* _LINUX_SCHED_USER_H */