fs/isofs/rock.h

   1 /*
   2  * These structs are used by the system-use-sharing protocol, in which the
   3  * Rock Ridge extensions are embedded.  It is quite possible that other
   4  * extensions are present on the disk, and this is fine as long as they
   5  * all use SUSP
   6  */
   7
   8 struct SU_SP_s {
   9         unsigned char magic[2];
  10         unsigned char skip;
  11 } __attribute__ ((packed));
  12
  13 struct SU_CE_s {
  14         char extent[8];
  15         char offset[8];
  16         char size[8];
  17 };
  18
  19 struct SU_ER_s {
  20         unsigned char len_id;
  21         unsigned char len_des;
  22         unsigned char len_src;
  23         unsigned char ext_ver;
  24         char data[0];
  25 } __attribute__ ((packed));
  26
  27 struct RR_RR_s {
  28         char flags[1];
  29 } __attribute__ ((packed));
  30
  31 struct RR_PX_s {
  32         char mode[8];
  33         char n_links[8];
  34         char uid[8];
  35         char gid[8];
  36 };
  37
  38 struct RR_PN_s {
  39         char dev_high[8];
  40         char dev_low[8];
  41 };
  42
  43 struct SL_component {
  44         unsigned char flags;
  45         unsigned char len;
  46         char text[0];
  47 } __attribute__ ((packed));
  48
  49 struct RR_SL_s {
  50         unsigned char flags;
  51         struct SL_component link;
  52 } __attribute__ ((packed));
  53
  54 struct RR_NM_s {
  55         unsigned char flags;
  56         char name[0];
  57 } __attribute__ ((packed));
  58
  59 struct RR_CL_s {
  60         char location[8];
  61 };
  62
  63 struct RR_PL_s {
  64         char location[8];
  65 };
  66
  67 struct stamp {
  68         __u8 time[7];           /* actually 6 unsigned, 1 signed */
  69 } __attribute__ ((packed));
  70
  71 struct RR_TF_s {
  72         char flags;
  73         struct stamp times[0];  /* Variable number of these beasts */
  74 } __attribute__ ((packed));
  75
  76 /* Linux-specific extension for transparent decompression */
  77 struct RR_ZF_s {
  78         char algorithm[2];
  79         char parms[2];
  80         char real_size[8];
  81 };
  82
  83 /*
  84  * These are the bits and their meanings for flags in the TF structure.
  85  */
  86 #define TF_CREATE 1
  87 #define TF_MODIFY 2
  88 #define TF_ACCESS 4
  89 #define TF_ATTRIBUTES 8
  90 #define TF_BACKUP 16
  91 #define TF_EXPIRATION 32
  92 #define TF_EFFECTIVE 64
  93 #define TF_LONG_FORM 128
  94
  95 struct rock_ridge {
  96         char signature[2];
  97         unsigned char len;
  98         unsigned char version;
  99         union {
 100                 struct SU_SP_s SP;
 101                 struct SU_CE_s CE;
 102                 struct SU_ER_s ER;
 103                 struct RR_RR_s RR;
 104                 struct RR_PX_s PX;
 105                 struct RR_PN_s PN;
 106                 struct RR_SL_s SL;
 107                 struct RR_NM_s NM;
 108                 struct RR_CL_s CL;
 109                 struct RR_PL_s PL;
 110                 struct RR_TF_s TF;
 111                 struct RR_ZF_s ZF;
 112         } u;
 113 };
 114
 115 #define RR_PX 1                 /* POSIX attributes */
 116 #define RR_PN 2                 /* POSIX devices */
 117 #define RR_SL 4                 /* Symbolic link */
 118 #define RR_NM 8                 /* Alternate Name */
 119 #define RR_CL 16                /* Child link */
 120 #define RR_PL 32                /* Parent link */
 121 #define RR_RE 64                /* Relocation directory */
 122 #define RR_TF 128               /* Timestamps */