1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * These structs are used by the system-use-sharing protocol, in which the
4 * Rock Ridge extensions are embedded. It is quite possible that other
5 * extensions are present on the disk, and this is fine as long as they
6 * all use SUSP
7 */
8
9 struct SU_SP_s {
10 __u8 magic[2];
11 __u8 skip;
12 } __attribute__ ((packed));
13
14 struct SU_CE_s {
15 __u8 extent[8];
16 __u8 offset[8];
17 __u8 size[8];
18 };
19
20 struct SU_ER_s {
21 __u8 len_id;
22 __u8 len_des;
23 __u8 len_src;
24 __u8 ext_ver;
25 __u8 data[];
26 } __attribute__ ((packed));
27
28 struct RR_RR_s {
29 __u8 flags[1];
30 } __attribute__ ((packed));
31
32 struct RR_PX_s {
33 __u8 mode[8];
34 __u8 n_links[8];
35 __u8 uid[8];
36 __u8 gid[8];
37 };
38
39 struct RR_PN_s {
40 __u8 dev_high[8];
41 __u8 dev_low[8];
42 };
43
44 struct SL_component {
45 __u8 flags;
46 __u8 len;
47 __u8 text[];
48 } __attribute__ ((packed));
49
50 struct RR_SL_s {
51 __u8 flags;
52 struct SL_component link;
53 } __attribute__ ((packed));
54
55 struct RR_NM_s {
56 __u8 flags;
57 char name[];
58 } __attribute__ ((packed));
59
60 struct RR_CL_s {
61 __u8 location[8];
62 };
63
64 struct RR_PL_s {
65 __u8 location[8];
66 };
67
68 struct stamp {
69 __u8 time[7]; /* actually 6 unsigned, 1 signed */
70 } __attribute__ ((packed));
71
72 struct RR_TF_s {
73 __u8 flags;
74 struct stamp times[]; /* Variable number of these beasts */
75 } __attribute__ ((packed));
76
77 /* Linux-specific extension for transparent decompression */
78 struct RR_ZF_s {
79 __u8 algorithm[2];
80 __u8 parms[2];
81 __u8 real_size[8];
82 };
83
84 /*
85 * These are the bits and their meanings for flags in the TF structure.
86 */
87 #define TF_CREATE 1
88 #define TF_MODIFY 2
89 #define TF_ACCESS 4
90 #define TF_ATTRIBUTES 8
91 #define TF_BACKUP 16
92 #define TF_EXPIRATION 32
93 #define TF_EFFECTIVE 64
94 #define TF_LONG_FORM 128
95
96 struct rock_ridge {
97 __u8 signature[2];
98 __u8 len;
99 __u8 version;
100 union {
101 struct SU_SP_s SP;
102 struct SU_CE_s CE;
103 struct SU_ER_s ER;
104 struct RR_RR_s RR;
105 struct RR_PX_s PX;
106 struct RR_PN_s PN;
107 struct RR_SL_s SL;
108 struct RR_NM_s NM;
109 struct RR_CL_s CL;
110 struct RR_PL_s PL;
111 struct RR_TF_s TF;
112 struct RR_ZF_s ZF;
113 } u;
114 };
115
116 #define RR_PX 1 /* POSIX attributes */
117 #define RR_PN 2 /* POSIX devices */
118 #define RR_SL 4 /* Symbolic link */
119 #define RR_NM 8 /* Alternate Name */
120 #define RR_CL 16 /* Child link */
121 #define RR_PL 32 /* Parent link */
122 #define RR_RE 64 /* Relocation directory */
123 #define RR_TF 128 /* Timestamps */
124
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