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        __u8 magic[2];
  11        __u8 skip;
  12} __attribute__ ((packed));
  13
  14struct SU_CE_s {
  15        __u8 extent[8];
  16        __u8 offset[8];
  17        __u8 size[8];
  18};
  19
  20struct 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
  28struct RR_RR_s {
  29        __u8 flags[1];
  30} __attribute__ ((packed));
  31
  32struct RR_PX_s {
  33        __u8 mode[8];
  34        __u8 n_links[8];
  35        __u8 uid[8];
  36        __u8 gid[8];
  37};
  38
  39struct RR_PN_s {
  40        __u8 dev_high[8];
  41        __u8 dev_low[8];
  42};
  43
  44struct SL_component {
  45        __u8 flags;
  46        __u8 len;
  47        __u8 text[0];
  48} __attribute__ ((packed));
  49
  50struct RR_SL_s {
  51        __u8 flags;
  52        struct SL_component link;
  53} __attribute__ ((packed));
  54
  55struct RR_NM_s {
  56        __u8 flags;
  57        char name[0];
  58} __attribute__ ((packed));
  59
  60struct RR_CL_s {
  61        __u8 location[8];
  62};
  63
  64struct RR_PL_s {
  65        __u8 location[8];
  66};
  67
  68struct stamp {
  69        __u8 time[7];           /* actually 6 unsigned, 1 signed */
  70} __attribute__ ((packed));
  71
  72struct 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 */
  78struct 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
  96struct 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