xref: /openbmc/linux/fs/isofs/rock.h (revision 5e01fdff)
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