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     ˆÁÀƒŒ³¿ÄÃ a    /* 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>

#include <linux/rh_kabi.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;

	RH_KABI_RESERVE(1)
	RH_KABI_RESERVE(2)
};

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 */
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  #   ˆÂÁƒu×ŸÀa–Ým_J*j"Tâjà›¸ )‹FÿÅ m    /* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_CLEANUP_H
#define _LINUX_CLEANUP_H

#include <linux/compiler.h>

/*
 * DEFINE_FREE(name, type, free):
 *	simple helper macro that defines the required wrapper for a __free()
 *	based cleanup function. @free is an expression using '_T' to access the
 *	variable. @free should typically include a NULL test before calling a
 *	function, see the example below.
 *
 * __free(name):
 *	variable attribute to add a scoped based cleanup to the variable.
 *
 * no_free_ptr(var):
 *	like a non-atomic xchg(var, NULL), such that the cleanup function will
 *	be inhibited -- provided it sanely deals with a NULL value.
 *
 *	NOTE: this has __must_check semantics so that it is harder to accidentally
 *	leak the resource.
 *
 * return_ptr(p):
 *	returns p while inhibiting the __free().
 *
 * Ex.
 *
 * DEFINE_FREE(kfree, void *, if (_T) kfree(_T))
 *
 * void *alloc_obj(...)
 * {
 *	struct obj *p __free(kfree) = kmalloc(...);
 *	if (!p)
 *		return NULL;
 *
 *	if (!init_obj(p))
 *		return NULL;
 *
 *	return_ptr(p);
 * }
 *
 * NOTE: the DEFINE_FREE()'s @free expression includes a NULL test even though
 * kfree() is fine to be called with a NULL value. This is on purpose. This way
 * the compiler sees the end of our alloc_obj() function as:
 *
 *	tmp = p;
 *	p = NULL;
 *	if (p)
 *		kfree(p);
 *	return tmp;
 *
 * And through the magic of value-propagation and dead-code-elimination, it
 * eliminates the actual cleanup call and compiles into:
 *
 *	return p;
 *
 * Without the NULL test it turns into a mess and the compiler can't help us.
 */

#define DEFINE_FREE(_name, _type, _free) \
	static inline void __free_##_name(void *p) { _type _T = *(_type *)p; _free; }

#define __free(_name)	__cleanup(__free_##_name)

#define __get_and_null(p, nullvalue)   \
	({                                  \
		__auto_type __ptr = &(p);   \
		__auto_type __val = *__ptr; \
		*__ptr = nullvalue;         \
		__val;                      \
	})

static inline __must_check
const volatile void * __must_check_fn(const volatile void *val)
{ return val; }

#define no_free_ptr(p) \
	((typeof(p)) __must_check_fn(__get_and_null(p, NULL)))

#define return_ptr(p)	return no_free_ptr(p)


/*
 * DEFINE_CLASS(name, type, exit, init, init_args...):
 *	he