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 defined(CONFIG_SECRETMEM) 30 atomic_long_t locked_vm; 31 #endif 32 #ifdef CONFIG_WATCH_QUEUE 33 atomic_t nr_watches; /* The number of watches this user currently has */ 34 #endif 35 36 /* Miscellaneous per-user rate limit */ 37 struct ratelimit_state ratelimit; 38 }; 39 40 extern int uids_sysfs_init(void); 41 42 extern struct user_struct *find_user(kuid_t); 43 44 extern struct user_struct root_user; 45 #define INIT_USER (&root_user) 46 47 48 /* per-UID process charging. */ 49 extern struct user_struct * alloc_uid(kuid_t); get_uid(struct user_struct * u)50static inline struct user_struct *get_uid(struct user_struct *u) 51 { 52 refcount_inc(&u->__count); 53 return u; 54 } 55 extern void free_uid(struct user_struct *); 56 57 #endif /* _LINUX_SCHED_USER_H */ 58