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/* 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 user_namespace;
extern struct user_namespace init_user_ns;
/**
* kuid_into_mnt - map a kuid down into a mnt_userns
* @mnt_userns: user namespace of the relevant mount
* @kuid: kuid to be mapped
*
* Return: @kuid mapped according to @mnt_userns.
* If @kuid has no mapping INVALID_UID is returned.
*/
static inline kuid_t kuid_into_mnt(struct user_namespace *mnt_userns,
kuid_t kuid)
{
return make_kuid(mnt_userns, __kuid_val(kuid));
}
/**
* kgid_into_mnt - map a kgid down into a mnt_userns
* @mnt_userns: user namespace of the relevant mount
* @kgid: kgid to be mapped
*
* Return: @kgid mapped according to @mnt_userns.
* If @kgid has no mapping INVALID_GID is returned.
*/
static inline kgid_t kgid_into_mnt(struct user_namespace *mnt_userns,
kgid_t kgid)
{
return make_kgid(mnt_userns, __kgid_val(kgid));
}
/**
* kuid_from_mnt - map a kuid up into a mnt_userns
* @mnt_userns: user namespace of the relevant mount
* @kuid: kuid to be mapped
*
* Return: @kuid mapped up according to @mnt_userns.
* If @kuid has no mapping INVALID_UID is returned.
*/
static inline kuid_t kuid_from_mnt(struct user_namespace *mnt_userns,
kuid_t kuid)
{
return KUIDT_INIT(from_kuid(mnt_userns, kuid));
}
/**
* kgid_from_mnt - map a kgid up into a mnt_userns
* @mnt_userns: user namespace of the relevant mount
* @kgid: kgid to be mapped
*
* Return: @kgid mapped up according to @mnt_userns.
* If @kgid has no mapping INVALID_GID is returned.
*/
static inline kgid_t kgid_from_mnt(struct user_namespace *mnt_userns,
kgid_t kgid)
{
return KGIDT_INIT(from_kgid(mnt_userns, kgid));
}
/**
* mapped_fsuid - return caller's fsuid mapped up into a mnt_userns
* @mnt_userns: user namespace of the relevant mount
*
* Use this helper to initialize a new vfs or filesystem object based on
* the caller's fsuid. A common example is initializing the i_uid field of
* a newly allocated inode triggered by a creation event such as mkdir or
* O_CREAT. Other examples include the allocation of quotas for a specific
* user.
*
* Return: the caller's current fsuid mapped up according to @mnt_userns.
*/
static inline kuid_t mapped_fsuid(struct user_namespace *mnt_userns)
{
return kuid_from_mnt(mnt_userns, current_fsuid());
}
/**
* mapped_fsgid - return caller's fsgid mapped up into a mnt_userns
* @mnt_userns: user namespace of the relevant mount
*
* Use this helper to initialize a new vfs or filesystem object based on
* the caller's fsgid. A common example is initializing the i_gid field of
* a newly allocated inode triggered by a creation event such as mkdir or
* O_CREAT. Other examples include the allocation of quotas for a specific
* user.
*
* Return: the caller's current fsgid mapped up according to @mnt_userns.
*/
static inline kgid_t mapped_fsgid(struct user_namespace *mnt_userns)
{
return kgid_from_mnt(mnt_userns, current_fsgid());
}
#endif /* _LINUX_MNT_IDMAPPING_H */
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