LXR linux/include/linux/drbd_tag

   1#ifndef DRBD_TAG_MAGIC_H
   2#define DRBD_TAG_MAGIC_H
   3
   4#define TT_END     0
   5#define TT_REMOVED 0xE000
   6
   7/* declare packet_type enums */
   8enum packet_types {
   9#define NL_PACKET(name, number, fields) P_ ## name = number,
  10#define NL_INTEGER(pn, pr, member)
  11#define NL_INT64(pn, pr, member)
  12#define NL_BIT(pn, pr, member)
  13#define NL_STRING(pn, pr, member, len)
  14#include "drbd_nl.h"
  15        P_nl_after_last_packet,
  16};
  17
  18/* These struct are used to deduce the size of the tag lists: */
  19#define NL_PACKET(name, number, fields) \
  20        struct name ## _tag_len_struct { fields };
  21#define NL_INTEGER(pn, pr, member)              \
  22        int member; int tag_and_len ## member;
  23#define NL_INT64(pn, pr, member)                \
  24        __u64 member; int tag_and_len ## member;
  25#define NL_BIT(pn, pr, member)          \
  26        unsigned char member:1; int tag_and_len ## member;
  27#define NL_STRING(pn, pr, member, len)  \
  28        unsigned char member[len]; int member ## _len; \
  29        int tag_and_len ## member;
  30#include "linux/drbd_nl.h"
  31
  32/* declate tag-list-sizes */
  33static const int tag_list_sizes[] = {
  34#define NL_PACKET(name, number, fields) 2 fields ,
  35#define NL_INTEGER(pn, pr, member)      + 4 + 4
  36#define NL_INT64(pn, pr, member)        + 4 + 8
  37#define NL_BIT(pn, pr, member)          + 4 + 1
  38#define NL_STRING(pn, pr, member, len)  + 4 + (len)
  39#include "drbd_nl.h"
  40};
  41
  42/* The two highest bits are used for the tag type */
  43#define TT_MASK      0xC000
  44#define TT_INTEGER   0x0000
  45#define TT_INT64     0x4000
  46#define TT_BIT       0x8000
  47#define TT_STRING    0xC000
  48/* The next bit indicates if processing of the tag is mandatory */
  49#define T_MANDATORY  0x2000
  50#define T_MAY_IGNORE 0x0000
  51#define TN_MASK      0x1fff
  52/* The remaining 13 bits are used to enumerate the tags */
  53
  54#define tag_type(T)   ((T) & TT_MASK)
  55#define tag_number(T) ((T) & TN_MASK)
  56
  57/* declare tag enums */
  58#define NL_PACKET(name, number, fields) fields
  59enum drbd_tags {
  60#define NL_INTEGER(pn, pr, member)     T_ ## member = pn | TT_INTEGER | pr ,
  61#define NL_INT64(pn, pr, member)       T_ ## member = pn | TT_INT64   | pr ,
  62#define NL_BIT(pn, pr, member)         T_ ## member = pn | TT_BIT     | pr ,
  63#define NL_STRING(pn, pr, member, len) T_ ## member = pn | TT_STRING  | pr ,
  64#include "drbd_nl.h"
  65};
  66
  67struct tag {
  68        const char *name;
  69        int type_n_flags;
  70        int max_len;
  71};
  72
  73/* declare tag names */
  74#define NL_PACKET(name, number, fields) fields
  75static const struct tag tag_descriptions[] = {
  76#define NL_INTEGER(pn, pr, member)     [ pn ] = { #member, TT_INTEGER | pr, sizeof(int)   },
  77#define NL_INT64(pn, pr, member)       [ pn ] = { #member, TT_INT64   | pr, sizeof(__u64) },
  78#define NL_BIT(pn, pr, member)         [ pn ] = { #member, TT_BIT     | pr, sizeof(int)   },
  79#define NL_STRING(pn, pr, member, len) [ pn ] = { #member, TT_STRING  | pr, (len)         },
  80#include "drbd_nl.h"
  81};
  82
  83#endif
  84