mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
90 lines
2.2 KiB
90 lines
2.2 KiB
/* 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 <linux/types.h> |
|
|
|
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_kprojid_munged(struct user_namespace *to, kprojid_t kprojid) |
|
{ |
|
projid_t projid = from_kprojid(to, kprojid); |
|
if (projid == (projid_t)-1) |
|
projid = OVERFLOW_PROJID; |
|
return projid; |
|
} |
|
|
|
static inline bool kprojid_has_mapping(struct user_namespace *ns, kprojid_t projid) |
|
{ |
|
return true; |
|
} |
|
|
|
#endif /* CONFIG_USER_NS */ |
|
|
|
#endif /* _LINUX_PROJID_H */
|
|
|