1 #ifndef _LINUX_PROJID_H
2 #define _LINUX_PROJID_H
5 * A set of types for the internal kernel types representing project ids.
7 * The types defined in this header allow distinguishing which project ids in
8 * the kernel are values used by userspace and which project id values are
9 * the internal kernel values. With the addition of user namespaces the values
10 * can be different. Using the type system makes it possible for the compiler
11 * to detect when we overlook these differences.
14 #include <linux/types.h>
16 struct user_namespace
;
17 extern struct user_namespace init_user_ns
;
19 typedef __kernel_uid32_t projid_t
;
25 static inline projid_t
__kprojid_val(kprojid_t projid
)
30 #define KPROJIDT_INIT(value) (kprojid_t){ value }
32 #define INVALID_PROJID KPROJIDT_INIT(-1)
33 #define OVERFLOW_PROJID 65534
35 static inline bool projid_eq(kprojid_t left
, kprojid_t right
)
37 return __kprojid_val(left
) == __kprojid_val(right
);
40 static inline bool projid_lt(kprojid_t left
, kprojid_t right
)
42 return __kprojid_val(left
) < __kprojid_val(right
);
45 static inline bool projid_valid(kprojid_t projid
)
47 return !projid_eq(projid
, INVALID_PROJID
);
50 static inline bool projid_valid_eq(kprojid_t left
, kprojid_t right
)
52 return projid_eq(left
, right
) && projid_valid(left
);
57 extern kprojid_t
make_kprojid(struct user_namespace
*from
, projid_t projid
);
59 extern projid_t
from_kprojid(struct user_namespace
*to
, kprojid_t projid
);
60 extern projid_t
from_kprojid_munged(struct user_namespace
*to
, kprojid_t projid
);
62 static inline bool kprojid_has_mapping(struct user_namespace
*ns
, kprojid_t projid
)
64 return from_kprojid(ns
, projid
) != (projid_t
)-1;
69 static inline kprojid_t
make_kprojid(struct user_namespace
*from
, projid_t projid
)
71 return KPROJIDT_INIT(projid
);
74 static inline projid_t
from_kprojid(struct user_namespace
*to
, kprojid_t kprojid
)
76 return __kprojid_val(kprojid
);
79 static inline projid_t
from_kprojid_munged(struct user_namespace
*to
, kprojid_t kprojid
)
81 projid_t projid
= from_kprojid(to
, kprojid
);
82 if (projid
== (projid_t
)-1)
83 projid
= OVERFLOW_PROJID
;
87 static inline bool kprojid_has_mapping(struct user_namespace
*ns
, kprojid_t projid
)
92 #endif /* CONFIG_USER_NS */
94 #endif /* _LINUX_PROJID_H */