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 #ifdef CONFIG_EPOLL 16 atomic_long_t epoll_watches; /* The number of file descriptors currently watched */ 17 #endif 18 unsigned long unix_inflight; /* How many files in flight in unix sockets */ 19 atomic_long_t pipe_bufs; /* how many pages are allocated in pipe buffers */ 20 21 /* Hash table maintenance information */ 22 struct hlist_node uidhash_node; 23 kuid_t uid; 24 25 #if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL) || \ 26 defined(CONFIG_NET) || defined(CONFIG_IO_URING) 27 atomic_long_t locked_vm; 28 #endif 29 #ifdef CONFIG_WATCH_QUEUE 30 atomic_t nr_watches; /* The number of watches this user currently has */ 31 #endif 32 33 /* Miscellaneous per-user rate limit */ 34 struct ratelimit_state ratelimit; 35 }; 36 37 extern int uids_sysfs_init(void); 38 39 extern struct user_struct *find_user(kuid_t); 40 41 extern struct user_struct root_user; 42 #define INIT_USER (&root_user) 43 44 45 /* per-UID process charging. */ 46 extern struct user_struct * alloc_uid(kuid_t); 47 static inline struct user_struct *get_uid(struct user_struct *u) 48 { 49 refcount_inc(&u->__count); 50 return u; 51 } 52 extern void free_uid(struct user_struct *); 53 54 #endif /* _LINUX_SCHED_USER_H */ 55