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Linux/include/linux/projid.h

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  1 #ifndef _LINUX_PROJID_H
  2 #define _LINUX_PROJID_H
  3 
  4 /*
  5  * A set of types for the internal kernel types representing project ids.
  6  *
  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.
 12  *
 13  */
 14 #include <linux/types.h>
 15 
 16 struct user_namespace;
 17 extern struct user_namespace init_user_ns;
 18 
 19 typedef __kernel_uid32_t projid_t;
 20 
 21 typedef struct {
 22         projid_t val;
 23 } kprojid_t;
 24 
 25 static inline projid_t __kprojid_val(kprojid_t projid)
 26 {
 27         return projid.val;
 28 }
 29 
 30 #define KPROJIDT_INIT(value) (kprojid_t){ value }
 31 
 32 #define INVALID_PROJID KPROJIDT_INIT(-1)
 33 #define OVERFLOW_PROJID 65534
 34 
 35 static inline bool projid_eq(kprojid_t left, kprojid_t right)
 36 {
 37         return __kprojid_val(left) == __kprojid_val(right);
 38 }
 39 
 40 static inline bool projid_lt(kprojid_t left, kprojid_t right)
 41 {
 42         return __kprojid_val(left) < __kprojid_val(right);
 43 }
 44 
 45 static inline bool projid_valid(kprojid_t projid)
 46 {
 47         return !projid_eq(projid, INVALID_PROJID);
 48 }
 49 
 50 #ifdef CONFIG_USER_NS
 51 
 52 extern kprojid_t make_kprojid(struct user_namespace *from, projid_t projid);
 53 
 54 extern projid_t from_kprojid(struct user_namespace *to, kprojid_t projid);
 55 extern projid_t from_kprojid_munged(struct user_namespace *to, kprojid_t projid);
 56 
 57 static inline bool kprojid_has_mapping(struct user_namespace *ns, kprojid_t projid)
 58 {
 59         return from_kprojid(ns, projid) != (projid_t)-1;
 60 }
 61 
 62 #else
 63 
 64 static inline kprojid_t make_kprojid(struct user_namespace *from, projid_t projid)
 65 {
 66         return KPROJIDT_INIT(projid);
 67 }
 68 
 69 static inline projid_t from_kprojid(struct user_namespace *to, kprojid_t kprojid)
 70 {
 71         return __kprojid_val(kprojid);
 72 }
 73 
 74 static inline projid_t from_kprojid_munged(struct user_namespace *to, kprojid_t kprojid)
 75 {
 76         projid_t projid = from_kprojid(to, kprojid);
 77         if (projid == (projid_t)-1)
 78                 projid = OVERFLOW_PROJID;
 79         return projid;
 80 }
 81 
 82 static inline bool kprojid_has_mapping(struct user_namespace *ns, kprojid_t projid)
 83 {
 84         return true;
 85 }
 86 
 87 #endif /* CONFIG_USER_NS */
 88 
 89 #endif /* _LINUX_PROJID_H */
 90 

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