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mnt_idmapping: add vfs[g,u]id_into_k[g,u]id()

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Add two tiny helpers to conver a vfsuid into a kuid.

Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2022-06-26 20:45:07 +02:00 • committed by Christian Brauner (Microsoft)
parent 45598fd4e2
commit c9fa2b07fa
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1 changed files with 26 additions and 0 deletions
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26
include/linux/mnt_idmapping.h
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@ -333,6 +333,19 @@ static inline bool vfsuid_has_fsmapping(struct user_namespace *mnt_userns,
return uid_valid(from_vfsuid(mnt_userns, fs_userns, vfsuid));
}
/**
* vfsuid_into_kuid - convert vfsuid into kuid
* @vfsuid: the vfsuid to convert
*
* This can be used when a vfsuid is committed as a kuid.
*
* Return: a kuid with the value of @vfsuid
*/
static inline kuid_t vfsuid_into_kuid(vfsuid_t vfsuid)
{
return AS_KUIDT(vfsuid);
}
/**
* from_vfsgid - map a vfsgid into the filesystem idmapping
* @mnt_userns: the mount's idmapping
@ -406,6 +419,19 @@ static inline bool vfsgid_has_fsmapping(struct user_namespace *mnt_userns,
return gid_valid(from_vfsgid(mnt_userns, fs_userns, vfsgid));
}
/**
* vfsgid_into_kgid - convert vfsgid into kgid
* @vfsgid: the vfsgid to convert
*
* This can be used when a vfsgid is committed as a kgid.
*
* Return: a kgid with the value of @vfsgid
*/
static inline kgid_t vfsgid_into_kgid(vfsgid_t vfsgid)
{
return AS_KGIDT(vfsgid);
}
/**
* mapped_fsuid - return caller's fsuid mapped up into a mnt_userns
* @mnt_userns: the mount's idmapping