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