/* SPDX-License-Identifier: GPL-2.0 */

#include <linux/uidgid.h>
#include <linux/atomic.h>
#include <linux/refcount.h>
#include <linux/ratelimit.h>

struct key;

 * Some day this will be a full-fledged user tracking system..
struct user_struct {
	refcount_t __count;	/* reference count */
	atomic_t processes;	/* How many processes does this user have? */
	atomic_t sigpending;	/* How many pending signals does this user have? */
	atomic_t fanotify_listeners;
	atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
	/* protected by mq_lock	*/
	unsigned long mq_bytes;	/* How many bytes can be allocated to mqueue? */
	unsigned long locked_shm; /* How many pages of mlocked shm ? */
	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 */

	 * These pointers can only change from NULL to a non-NULL value once.
	 * Writes are protected by key_user_keyring_mutex.
	 * Unlocked readers should use READ_ONCE() unless they know that
	 * install_user_keyrings() has been called successfully (which sets
	 * these members to non-NULL values, preventing further modifications).
	struct key *uid_keyring;	/* UID specific keyring */
	struct key *session_keyring;	/* UID's default session keyring */

	/* 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)
	atomic_long_t locked_vm;

	/* 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)
	return u;
extern void free_uid(struct user_struct *);

#endif /* _LINUX_SCHED_USER_H */