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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_PROJID_H #define _LINUX_PROJID_H /* * A set of types for the internal kernel types representing project ids. * * The types defined in this header allow distinguishing which project ids in * the kernel are values used by userspace and which project id values are * the internal kernel values. With the addition of user namespaces the values * can be different. Using the type system makes it possible for the compiler * to detect when we overlook these differences. * */ #include struct user_namespace; extern struct user_namespace init_user_ns; typedef __kernel_uid32_t projid_t; typedef struct { projid_t val; } kprojid_t; static inline projid_t __kprojid_val(kprojid_t projid) { return projid.val; } #define KPROJIDT_INIT(value) (kprojid_t){ value } #define INVALID_PROJID KPROJIDT_INIT(-1) #define OVERFLOW_PROJID 65534 static inline bool projid_eq(kprojid_t left, kprojid_t right) { return __kprojid_val(left) == __kprojid_val(right); } static inline bool projid_lt(kprojid_t left, kprojid_t right) { return __kprojid_val(left) < __kprojid_val(right); } static inline bool projid_valid(kprojid_t projid) { return !projid_eq(projid, INVALID_PROJID); } #ifdef CONFIG_USER_NS extern kprojid_t make_kprojid(struct user_namespace *from, projid_t projid); extern projid_t from_kprojid(struct user_namespace *to, kprojid_t projid); extern projid_t from_kprojid_munged(struct user_namespace *to, kprojid_t projid); static inline bool kprojid_has_mapping(struct user_namespace *ns, kprojid_t projid) { return from_kprojid(ns, projid) != (projid_t)-1; } #else static inline kprojid_t make_kprojid(struct user_namespace *from, projid_t projid) { return KPROJIDT_INIT(projid); } static inline projid_t from_kprojid(struct user_namespace *to, kprojid_t kprojid) { return __kprojid_val(kprojid); } static inline projid_t from_kpro