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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_SCHED_USER_H
#define _LINUX_SCHED_USER_H
#include <linux/uidgid.h>
#include <linux/atomic.h>
#include <linux/percpu_counter.h>
#include <linux/refcount.h>
#include <linux/ratelimit.h>
/*
* Some day this will be a full-fledged user tracking system..
*/
struct user_struct {
refcount_t __count; /* reference count */
#ifdef CONFIG_EPOLL
struct percpu_counter epoll_watches; /* The number of file descriptors currently watched */
#endif
unsigned long unix_inflight; /* How many files in flight in unix sockets */
atomic_long_t pipe_bufs; /* how many pages are allocated in pipe buffers */
/* Hash table maintenance information */
struct hlist_node uidhash_node;
kuid_t uid;
#if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL) || \
defined(CONFIG_NET) || defined(CONFIG_IO_URING) || \
defined(CONFIG_VFIO_PCI_ZDEV_KVM) || IS_ENABLED(CONFIG_IOMMUFD)
atomic_long_t locked_vm;
#endif
#ifdef CONFIG_WATCH_QUEUE
atomic_t nr_watches; /* The number of watches this user currently has */
#endif
/* Miscellaneous per-user rate limit */
struct ratelimit_state ratelimit;
};
extern int uids_sysfs_init(void);
extern struct user_struct *find_user(kuid_t);
extern struct user_struct root_user;
#define INIT_USER (&root_user)
/* per-UID process charging. */
extern struct user_struct * alloc_uid(kuid_t);
static inline struct user_struct *get_uid(struct user_struct *u)
{
refcount_inc(&u->__count);
return u;
}
extern void free_uid(struct user_struct *);
#endif /* _LINUX_SCHED_USER_H */