0-3
  "   ˆl–Ü4ý()¨‰P@Š	›³q§Å£Áƒh¹À¿      9.8
  *   ˆl–Ü4ý( ©³( 	Å€fàB¦-ÿÂƒ­_†I|¥+ÂÁ     ˆ¿Ãƒu§]¾ÂÁ 5    /* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_MNT_IDMAPPING_H
#define _LINUX_MNT_IDMAPPING_H

#include <linux/types.h>
#include <linux/uidgid.h>

struct mnt_idmap;
struct user_namespace;

extern struct mnt_idmap nop_mnt_idmap;
extern struct user_namespace init_user_ns;

typedef struct {
	uid_t val;
} vfsuid_t;

typedef struct {
	gid_t val;
} vfsgid_t;

static_assert(sizeof(vfsuid_t) == sizeof(kuid_t));
static_assert(sizeof(vfsgid_t) == sizeof(kgid_t));
static_assert(offsetof(vfsuid_t, val) == offsetof(kuid_t, val));
static_assert(offsetof(vfsgid_t, val) == offsetof(kgid_t, val));

#ifdef CONFIG_MULTIUSER
static inline uid_t __vfsuid_val(vfsuid_t uid)
{
	return uid.val;
}

static inline gid_t __vfsgid_val(vfsgid_t gid)
{
	return gid.val;
}
#else
static inline uid_t __vfsuid_val(vfsuid_t uid)
{
	return 0;
}

static inline gid_t __vfsgid_val(vfsgid_t gid)
{
	return 0;
}
#endif

static inline bool vfsuid_valid(vfsuid_t uid)
{
	return __vfsuid_val(uid) != (uid_t)-1;
}

static inline bool vfsgid_valid(vfsgid_t gid)
{
	return __vfsgid_val(gid) != (gid_t)-1;
}

static inline bool vfsuid_eq(vfsuid_t left, vfsuid_t right)
{
	return vfsuid_valid(left) && __vfsuid_val(left) == __vfsuid_val(right);
}

static inline bool vfsgid_eq(vfsgid_t left, vfsgid_t right)
{
	return vfsgid_valid(left) && __vfsgid_val(left) == __vfsgid_val(right);
}

/**
 * vfsuid_eq_kuid - check whether kuid and vfsuid have the same value
 * @vfsuid: the vfsuid to compare
 * @kuid: the kuid to compare
 *
 * Check whether @vfsuid and @kuid have the same values.
 *
 * Return: true if @vfsuid and @kuid have the same value, false if not.
 * Comparison between two invalid uids returns false.
 */
static inline bool vfsuid_eq_kuid(vfsuid_t vfsuid, kuid_t kuid)
{
	return vfsuid_valid(vfsuid) && __vfsuid_val(vfsuid) == __kuid_val(kuid);
}

/**
 * vfsgid_eq_kgid - check whether kgid and vfsgid have the same value
 * @vfsgid: the vfsgid to compare
 * @kgid: the kgid to compare
 *
 * Check whether @vfsgid and @kgid have the same values.
 *
 * Return: true if @vfsgid and @kgid have the same value, false if not.
 * Comparison between two invalid gids returns false.
 */
static inline bool vfsgid_eq_kgid(vfsgid_t vfsgid, kgid_t kgid)
{
	return vfsgid_valid(vfsgid) && __vfsgid_val(vfsgid) == __kgid_val(kgid);
}

static inline bool vfsuid_gt_kuid(vfsuid_t vfsuid, kuid_t kuid)
{
	return __vfsuid_val(vfsuid) > __kuid_val(kuid);
}

static inline bool vfsgid_gt_kgid(vfsgid_t vfsgid, kgid_t kgid)
{
	return __vfsgid_val(vfsgid) > __kgid_val(kgid);
}

static inline bool vfsuid_lt_kuid(vfsuid_t vfsuid, kuid_t kuid)
{
	return __vfsuid_val(vfsuid) < __kuid_val(kuid);
}

static inline bool vfsgid_lt_kgid(vfsgid_t vfsgid, kgid_t kgid)
{
	return __vfsgid_val(vfsgid) < __kgid_val(kgid);
}

/*
 * vfs{g,u}ids are created from k{g,u}ids.
 * We don't allow them to be created from regular {u,g}id.
 */
#define VFSUIDT_INIT(val) (vfsuid_t){ __kuid_val(val) }
#define VFSGIDT_INIT(val) (vfsgid_t){ __kgid_val(val) }

#define INVALID_VFSUID VFSUIDT_INIT(INVALID_UID)
#define INVALID_VFSGID VFSGIDT_INIT(INVALID_GID)

/*
 * Allow a vfs{g,u}id to be used as a k{g,u}id where we want to compare
 * whether the mapped value is identical to value of a k{g,u}id.
 */
#define AS_KUIDT(val) (kuid_t){ __vfsuid_val(val) }
#define AS_KGIDT(val) (kgid_t){ __vfsgid_val(val) }

int vfsgid_in_group_p(vfsgid_t vfsgid);

struct mnt_idmap *mnt_idmap_get(struct mnt_idmap *idmap);
void mnt_idmap_put(struct mnt_idmap *idmap);

vfsuid_t make_vfsuid(struct mnt_idmap *idmap,
		     struct user_namespace *fs_userns, kuid_t kuid);

vfsgid_t make_vfsgid(struct mnt_idmap *idmap,
		     struct user_namespace *fs_userns, kgid_t kgid);

kuid_t from_vfsuid(struct mnt_idmap *idmap,
		   struct user_namespace *fs_userns, vfsuid_t vfsuid);

kgid_t from_vfsgid(struct mnt_idmap *idmap,
		   struct user_namespace *fs_userns, vfsgid_t vfsgid);

/**
 * vfsuid_has_fsmapping - check whether a vfsuid maps