LXR linux/fs/isofs/rock.h

   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
   9struct SU_SP_s {
  10        unsigned char magic[2];
  11        unsigned char skip;
  12} __attribute__ ((packed));
  13
  14struct SU_CE_s {
  15        char extent[8];
  16        char offset[8];
  17        char size[8];
  18};
  19
  20struct SU_ER_s {
  21        unsigned char len_id;
  22        unsigned char len_des;
  23        unsigned char len_src;
  24        unsigned char ext_ver;
  25        char data[0];
  26} __attribute__ ((packed));
  27
  28struct RR_RR_s {
  29        char flags[1];
  30} __attribute__ ((packed));
  31
  32struct RR_PX_s {
  33        char mode[8];
  34        char n_links[8];
  35        char uid[8];
  36        char gid[8];
  37};
  38
  39struct RR_PN_s {
  40        char dev_high[8];
  41        char dev_low[8];
  42};
  43
  44struct SL_component {
  45        unsigned char flags;
  46        unsigned char len;
  47        char text[0];
  48} __attribute__ ((packed));
  49
  50struct RR_SL_s {
  51        unsigned char flags;
  52        struct SL_component link;
  53} __attribute__ ((packed));
  54
  55struct RR_NM_s {
  56        unsigned char flags;
  57        char name[0];
  58} __attribute__ ((packed));
  59
  60struct RR_CL_s {
  61        char location[8];
  62};
  63
  64struct RR_PL_s {
  65        char location[8];
  66};
  67
  68struct stamp {
  69        char time[7];
  70} __attribute__ ((packed));
  71
  72struct RR_TF_s {
  73        char flags;
  74        struct stamp times[0];  /* Variable number of these beasts */
  75} __attribute__ ((packed));
  76
  77/* Linux-specific extension for transparent decompression */
  78struct RR_ZF_s {
  79        char algorithm[2];
  80        char parms[2];
  81        char 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
  96struct rock_ridge {
  97        char signature[2];
  98        unsigned char len;
  99        unsigned char 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