include/linux/uuid.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * UUID/GUID definition
   4  *
   5  * Copyright (C) 2010, 2016 Intel Corp.
   6  *      Huang Ying <ying.huang@intel.com>
   7  */
   8 #ifndef _LINUX_UUID_H_
   9 #define _LINUX_UUID_H_
  10
  11 #include <uapi/linux/uuid.h>
  12 #include <linux/string.h>
  13
  14 #define UUID_SIZE 16
  15
  16 typedef struct {
  17         __u8 b[UUID_SIZE];
  18 } uuid_t;
  19
  20 #define UUID_INIT(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7)                      \
  21 ((uuid_t)                                                               \
  22 {{ ((a) >> 24) & 0xff, ((a) >> 16) & 0xff, ((a) >> 8) & 0xff, (a) & 0xff, \
  23    ((b) >> 8) & 0xff, (b) & 0xff,                                       \
  24    ((c) >> 8) & 0xff, (c) & 0xff,                                       \
  25    (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})
  26
  27 /*
  28  * The length of a UUID string ("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee")
  29  * not including trailing NUL.
  30  */
  31 #define UUID_STRING_LEN         36
  32
  33 extern const guid_t guid_null;
  34 extern const uuid_t uuid_null;
  35
  36 static inline bool guid_equal(const guid_t *u1, const guid_t *u2)
  37 {
  38         return memcmp(u1, u2, sizeof(guid_t)) == 0;
  39 }
  40
  41 static inline void guid_copy(guid_t *dst, const guid_t *src)
  42 {
  43         memcpy(dst, src, sizeof(guid_t));
  44 }
  45
  46 static inline bool guid_is_null(const guid_t *guid)
  47 {
  48         return guid_equal(guid, &guid_null);
  49 }
  50
  51 static inline bool uuid_equal(const uuid_t *u1, const uuid_t *u2)
  52 {
  53         return memcmp(u1, u2, sizeof(uuid_t)) == 0;
  54 }
  55
  56 static inline void uuid_copy(uuid_t *dst, const uuid_t *src)
  57 {
  58         memcpy(dst, src, sizeof(uuid_t));
  59 }
  60
  61 static inline bool uuid_is_null(const uuid_t *uuid)
  62 {
  63         return uuid_equal(uuid, &uuid_null);
  64 }
  65
  66 void generate_random_uuid(unsigned char uuid[16]);
  67
  68 extern void guid_gen(guid_t *u);
  69 extern void uuid_gen(uuid_t *u);
  70
  71 bool __must_check uuid_is_valid(const char *uuid);
  72
  73 extern const u8 guid_index[16];
  74 extern const u8 uuid_index[16];
  75
  76 int guid_parse(const char *uuid, guid_t *u);
  77 int uuid_parse(const char *uuid, uuid_t *u);
  78
  79 /* backwards compatibility, don't use in new code */
  80 #define uuid_le_gen(u)          guid_gen(u)
  81 #define uuid_le_to_bin(guid, u) guid_parse(guid, u)
  82
  83 static inline int uuid_le_cmp(const guid_t u1, const guid_t u2)
  84 {
  85         return memcmp(&u1, &u2, sizeof(guid_t));
  86 }
  87
  88 #endif