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