LXR linux/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
   8struct SU_SP_s {
   9        unsigned char magic[2];
  10        unsigned char skip;
  11} __attribute__ ((packed));
  12
  13struct SU_CE_s {
  14        char extent[8];
  15        char offset[8];
  16        char size[8];
  17};
  18
  19struct 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
  27struct RR_RR_s {
  28        char flags[1];
  29} __attribute__ ((packed));
  30
  31struct RR_PX_s {
  32        char mode[8];
  33        char n_links[8];
  34        char uid[8];
  35        char gid[8];
  36};
  37
  38struct RR_PN_s {
  39        char dev_high[8];
  40        char dev_low[8];
  41};
  42
  43struct SL_component {
  44        unsigned char flags;
  45        unsigned char len;
  46        char text[0];
  47} __attribute__ ((packed));
  48
  49struct RR_SL_s {
  50        unsigned char flags;
  51        struct SL_component link;
  52} __attribute__ ((packed));
  53
  54struct RR_NM_s {
  55        unsigned char flags;
  56        char name[0];
  57} __attribute__ ((packed));
  58
  59struct RR_CL_s {
  60        char location[8];
  61};
  62
  63struct RR_PL_s {
  64        char location[8];
  65};
  66
  67struct stamp {
  68        char time[7];
  69} __attribute__ ((packed));
  70
  71struct 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 */
  77struct 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
  95struct 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 */
 123