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Revert "fs: remove unused low-level mapping helpers"

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This reverts commit d6e05a8024.
This commit is contained in:
Jaegeuk Kim
2023-01-04 12:59:55 -08:00
parent adecd8eeae
commit 76d110ca40
1 changed files with 56 additions and 0 deletions
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56
include/linux/mnt_idmapping.h
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@@ -13,6 +13,62 @@ 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));
}
/**
* initial_idmapping - check whether this is the initial mapping
* @ns: idmapping to check