diff --git a/include/linux/fs.h b/include/linux/fs.h
index fd0b80e6361d..3165998e2294 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -40,6 +40,7 @@
 #include <linux/build_bug.h>
 #include <linux/stddef.h>
 #include <linux/mount.h>
+#include <linux/cred.h>
 
 #include <asm/byteorder.h>
 #include <uapi/linux/fs.h>
@@ -1573,6 +1574,52 @@ static inline void i_gid_write(struct inode *inode, gid_t gid)
 	inode->i_gid = make_kgid(inode->i_sb->s_user_ns, gid);
 }
 
+static inline kuid_t kuid_into_mnt(struct user_namespace *mnt_userns,
+				   kuid_t kuid)
+{
+	return make_kuid(mnt_userns, __kuid_val(kuid));
+}
+
+static inline kgid_t kgid_into_mnt(struct user_namespace *mnt_userns,
+				   kgid_t kgid)
+{
+	return make_kgid(mnt_userns, __kgid_val(kgid));
+}
+
+static inline kuid_t i_uid_into_mnt(struct user_namespace *mnt_userns,
+				    const struct inode *inode)
+{
+	return kuid_into_mnt(mnt_userns, inode->i_uid);
+}
+
+static inline kgid_t i_gid_into_mnt(struct user_namespace *mnt_userns,
+				    const struct inode *inode)
+{
+	return kgid_into_mnt(mnt_userns, inode->i_gid);
+}
+
+static inline kuid_t kuid_from_mnt(struct user_namespace *mnt_userns,
+				   kuid_t kuid)
+{
+	return KUIDT_INIT(from_kuid(mnt_userns, kuid));
+}
+
+static inline kgid_t kgid_from_mnt(struct user_namespace *mnt_userns,
+				   kgid_t kgid)
+{
+	return KGIDT_INIT(from_kgid(mnt_userns, kgid));
+}
+
+static inline kuid_t fsuid_into_mnt(struct user_namespace *mnt_userns)
+{
+	return kuid_from_mnt(mnt_userns, current_fsuid());
+}
+
+static inline kgid_t fsgid_into_mnt(struct user_namespace *mnt_userns)
+{
+	return kgid_from_mnt(mnt_userns, current_fsgid());
+}
+
 extern struct timespec64 current_time(struct inode *inode);
 
 /*