xref: /linux/fs/isofs/rock.h (revision 2b64b2ed277ff23e785fbdb65098ee7e1252d64f)
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[0];
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[0];
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[0];
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[0];	/* 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