summaryrefslogtreecommitdiffstats
path: root/fs/isofs/rock.h
blob: 9d3cbc762380cfbc7400b35c99c48fc53bd5ddc9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
/*
 * These structs are used by the system-use-sharing protocol, in which the
 * Rock Ridge extensions are embedded.  It is quite possible that other
 * extensions are present on the disk, and this is fine as long as they
 * all use SUSP
 */

struct SU_SP {
	unsigned char magic[2];
	unsigned char skip;
} __attribute__ ((packed));

struct SU_CE {
	char extent[8];
	char offset[8];
	char size[8];
};

struct SU_ER {
	unsigned char len_id;
	unsigned char len_des;
	unsigned char len_src;
	unsigned char ext_ver;
	char data[0];
} __attribute__ ((packed));

struct RR_RR {
	char flags[1];
} __attribute__ ((packed));

struct RR_PX {
	char mode[8];
	char n_links[8];
	char uid[8];
	char gid[8];
};

struct RR_PN {
	char dev_high[8];
	char dev_low[8];
};

struct SL_component {
	unsigned char flags;
	unsigned char len;
	char text[0];
} __attribute__ ((packed));

struct RR_SL {
	unsigned char flags;
	struct SL_component link;
} __attribute__ ((packed));

struct RR_NM {
	unsigned char flags;
	char name[0];
} __attribute__ ((packed));

struct RR_CL {
	char location[8];
};

struct RR_PL {
	char location[8];
};

struct stamp {
	char time[7];
} __attribute__ ((packed));

struct RR_TF {
	char flags;
	struct stamp times[0];	/* Variable number of these beasts */
} __attribute__ ((packed));

/* Linux-specific extension for transparent decompression */
struct RR_ZF {
	char algorithm[2];
	char parms[2];
	char real_size[8];
};

/*
 * These are the bits and their meanings for flags in the TF structure.
 */
#define TF_CREATE 1
#define TF_MODIFY 2
#define TF_ACCESS 4
#define TF_ATTRIBUTES 8
#define TF_BACKUP 16
#define TF_EXPIRATION 32
#define TF_EFFECTIVE 64
#define TF_LONG_FORM 128

struct rock_ridge {
	char signature[2];
	unsigned char len;
	unsigned char version;
	union {
		struct SU_SP SP;
		struct SU_CE CE;
		struct SU_ER ER;
		struct RR_RR RR;
		struct RR_PX PX;
		struct RR_PN PN;
		struct RR_SL SL;
		struct RR_NM NM;
		struct RR_CL CL;
		struct RR_PL PL;
		struct RR_TF TF;
		struct RR_ZF ZF;
	} u;
};

#define RR_PX 1			/* POSIX attributes */
#define RR_PN 2			/* POSIX devices */
#define RR_SL 4			/* Symbolic link */
#define RR_NM 8			/* Alternate Name */
#define RR_CL 16		/* Child link */
#define RR_PL 32		/* Parent link */
#define RR_RE 64		/* Relocation directory */
#define RR_TF 128		/* Timestamps */