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include/linux/drbd_tag_magic.h
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The DRBD driver
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#ifndef DRBD_TAG_MAGIC_H
#define DRBD_TAG_MAGIC_H
#define TT_END 0
#define TT_REMOVED 0xE000
/* declare packet_type enums */
enum packet_types {
#define NL_PACKET(name, number, fields) P_ ## name = number,
#define NL_INTEGER(pn, pr, member)
#define NL_INT64(pn, pr, member)
#define NL_BIT(pn, pr, member)
#define NL_STRING(pn, pr, member, len)
#include "drbd_nl.h"
P_nl_after_last_packet,
};
/* These struct are used to deduce the size of the tag lists: */
#define NL_PACKET(name, number, fields) \
struct name ## _tag_len_struct { fields };
#define NL_INTEGER(pn, pr, member) \
int member; int tag_and_len ## member;
#define NL_INT64(pn, pr, member) \
__u64 member; int tag_and_len ## member;
#define NL_BIT(pn, pr, member) \
unsigned char member:1; int tag_and_len ## member;
#define NL_STRING(pn, pr, member, len) \
unsigned char member[len]; int member ## _len; \
int tag_and_len ## member;
#include "linux/drbd_nl.h"
/* declate tag-list-sizes */
static const int tag_list_sizes[] = {
#define NL_PACKET(name, number, fields) 2 fields ,
#define NL_INTEGER(pn, pr, member) + 4 + 4
#define NL_INT64(pn, pr, member) + 4 + 8
#define NL_BIT(pn, pr, member) + 4 + 1
#define NL_STRING(pn, pr, member, len) + 4 + (len)
#include "drbd_nl.h"
};
/* The two highest bits are used for the tag type */
#define TT_MASK 0xC000
#define TT_INTEGER 0x0000
#define TT_INT64 0x4000
#define TT_BIT 0x8000
#define TT_STRING 0xC000
/* The next bit indicates if processing of the tag is mandatory */
#define T_MANDATORY 0x2000
#define T_MAY_IGNORE 0x0000
#define TN_MASK 0x1fff
/* The remaining 13 bits are used to enumerate the tags */
#define tag_type(T) ((T) & TT_MASK)
#define tag_number(T) ((T) & TN_MASK)
/* declare tag enums */
#define NL_PACKET(name, number, fields) fields
enum drbd_tags {
#define NL_INTEGER(pn, pr, member) T_ ## member = pn | TT_INTEGER | pr ,
#define NL_INT64(pn, pr, member) T_ ## member = pn | TT_INT64 | pr ,
#define NL_BIT(pn, pr, member) T_ ## member = pn | TT_BIT | pr ,
#define NL_STRING(pn, pr, member, len) T_ ## member = pn | TT_STRING | pr ,
#include "drbd_nl.h"
};
struct tag {
const char *name;
int type_n_flags;
int max_len;
};
/* declare tag names */
#define NL_PACKET(name, number, fields) fields
static const struct tag tag_descriptions[] = {
#define NL_INTEGER(pn, pr, member) [ pn ] = { #member, TT_INTEGER | pr, sizeof(int) },
#define NL_INT64(pn, pr, member) [ pn ] = { #member, TT_INT64 | pr, sizeof(__u64) },
#define NL_BIT(pn, pr, member) [ pn ] = { #member, TT_BIT | pr, sizeof(int) },
#define NL_STRING(pn, pr, member, len) [ pn ] = { #member, TT_STRING | pr, (len) },
#include "drbd_nl.h"
};
#endif
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