1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_PROJID_H 2 #ifndef _LINUX_PROJID_H
3 #define _LINUX_PROJID_H 3 #define _LINUX_PROJID_H
4 4
5 /* 5 /*
6 * A set of types for the internal kernel type 6 * A set of types for the internal kernel types representing project ids.
7 * 7 *
8 * The types defined in this header allow dist 8 * The types defined in this header allow distinguishing which project ids in
9 * the kernel are values used by userspace and 9 * the kernel are values used by userspace and which project id values are
10 * the internal kernel values. With the addit 10 * the internal kernel values. With the addition of user namespaces the values
11 * can be different. Using the type system ma 11 * can be different. Using the type system makes it possible for the compiler
12 * to detect when we overlook these difference 12 * to detect when we overlook these differences.
13 * 13 *
14 */ 14 */
15 #include <linux/types.h> 15 #include <linux/types.h>
16 16
17 struct user_namespace; 17 struct user_namespace;
18 extern struct user_namespace init_user_ns; 18 extern struct user_namespace init_user_ns;
19 19
20 typedef __kernel_uid32_t projid_t; 20 typedef __kernel_uid32_t projid_t;
21 21
22 typedef struct { 22 typedef struct {
23 projid_t val; 23 projid_t val;
24 } kprojid_t; 24 } kprojid_t;
25 25
26 static inline projid_t __kprojid_val(kprojid_t 26 static inline projid_t __kprojid_val(kprojid_t projid)
27 { 27 {
28 return projid.val; 28 return projid.val;
29 } 29 }
30 30
31 #define KPROJIDT_INIT(value) (kprojid_t){ valu 31 #define KPROJIDT_INIT(value) (kprojid_t){ value }
32 32
33 #define INVALID_PROJID KPROJIDT_INIT(-1) 33 #define INVALID_PROJID KPROJIDT_INIT(-1)
34 #define OVERFLOW_PROJID 65534 34 #define OVERFLOW_PROJID 65534
35 35
36 static inline bool projid_eq(kprojid_t left, k 36 static inline bool projid_eq(kprojid_t left, kprojid_t right)
37 { 37 {
38 return __kprojid_val(left) == __kproji 38 return __kprojid_val(left) == __kprojid_val(right);
39 } 39 }
40 40
41 static inline bool projid_lt(kprojid_t left, k 41 static inline bool projid_lt(kprojid_t left, kprojid_t right)
42 { 42 {
43 return __kprojid_val(left) < __kprojid 43 return __kprojid_val(left) < __kprojid_val(right);
44 } 44 }
45 45
46 static inline bool projid_valid(kprojid_t proj 46 static inline bool projid_valid(kprojid_t projid)
47 { 47 {
48 return !projid_eq(projid, INVALID_PROJ 48 return !projid_eq(projid, INVALID_PROJID);
49 } 49 }
50 50
51 #ifdef CONFIG_USER_NS 51 #ifdef CONFIG_USER_NS
52 52
53 extern kprojid_t make_kprojid(struct user_name 53 extern kprojid_t make_kprojid(struct user_namespace *from, projid_t projid);
54 54
55 extern projid_t from_kprojid(struct user_names 55 extern projid_t from_kprojid(struct user_namespace *to, kprojid_t projid);
56 extern projid_t from_kprojid_munged(struct use 56 extern projid_t from_kprojid_munged(struct user_namespace *to, kprojid_t projid);
57 57
58 static inline bool kprojid_has_mapping(struct 58 static inline bool kprojid_has_mapping(struct user_namespace *ns, kprojid_t projid)
59 { 59 {
60 return from_kprojid(ns, projid) != (pr 60 return from_kprojid(ns, projid) != (projid_t)-1;
61 } 61 }
62 62
63 #else 63 #else
64 64
65 static inline kprojid_t make_kprojid(struct us 65 static inline kprojid_t make_kprojid(struct user_namespace *from, projid_t projid)
66 { 66 {
67 return KPROJIDT_INIT(projid); 67 return KPROJIDT_INIT(projid);
68 } 68 }
69 69
70 static inline projid_t from_kprojid(struct use 70 static inline projid_t from_kprojid(struct user_namespace *to, kprojid_t kprojid)
71 { 71 {
72 return __kprojid_val(kprojid); 72 return __kprojid_val(kprojid);
73 } 73 }
74 74
75 static inline projid_t from_kprojid_munged(str 75 static inline projid_t from_kprojid_munged(struct user_namespace *to, kprojid_t kprojid)
76 { 76 {
77 projid_t projid = from_kprojid(to, kpr 77 projid_t projid = from_kprojid(to, kprojid);
78 if (projid == (projid_t)-1) 78 if (projid == (projid_t)-1)
79 projid = OVERFLOW_PROJID; 79 projid = OVERFLOW_PROJID;
80 return projid; 80 return projid;
81 } 81 }
82 82
83 static inline bool kprojid_has_mapping(struct 83 static inline bool kprojid_has_mapping(struct user_namespace *ns, kprojid_t projid)
84 { 84 {
85 return true; 85 return true;
86 } 86 }
87 87
88 #endif /* CONFIG_USER_NS */ 88 #endif /* CONFIG_USER_NS */
89 89
90 #endif /* _LINUX_PROJID_H */ 90 #endif /* _LINUX_PROJID_H */
91 91
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