blktrace.h

   1 #ifndef BLKTRACE_H
   2 #define BLKTRACE_H
   3
   4 #include <byteswap.h>
   5 #include <asm/types.h>
   6 #include <asm/byteorder.h>
   7 #include "blktrace_api.h"
   8
   9 #define CHECK_MAGIC(t)          (((t)->magic & 0xffffff00) == BLK_IO_TRACE_MAGIC)
  10 #define SUPPORTED_VERSION       (0x02)
  11
  12 #if defined(__LITTLE_ENDIAN_BITFIELD)
  13 #define be16_to_cpu(x)          __bswap_16(x)
  14 #define be32_to_cpu(x)          __bswap_32(x)
  15 #define be64_to_cpu(x)          __bswap_64(x)
  16 #define cpu_to_be16(x)          __bswap_16(x)
  17 #define cpu_to_be32(x)          __bswap_32(x)
  18 #define cpu_to_be64(x)          __bswap_64(x)
  19 #elif defined(__BIG_ENDIAN_BITFIELD)
  20 #define be16_to_cpu(x)          (x)
  21 #define be32_to_cpu(x)          (x)
  22 #define be64_to_cpu(x)          (x)
  23 #define cpu_to_be16(x)          (x)
  24 #define cpu_to_be32(x)          (x)
  25 #define cpu_to_be64(x)          (x)
  26 #else
  27 #error "Bad arch"
  28 #endif
  29
  30 static inline int verify_trace(struct blk_io_trace *t)
  31 {
  32         if (!CHECK_MAGIC(t)) {
  33                 fprintf(stderr, "bad trace magic %x\n", t->magic);
  34                 return 1;
  35         }
  36         if ((t->magic & 0xff) != SUPPORTED_VERSION) {
  37                 fprintf(stderr, "unsupported trace version %x\n",
  38                         t->magic & 0xff);
  39                 return 1;
  40         }
  41
  42         return 0;
  43 }
  44
  45 static inline void trace_to_be(struct blk_io_trace *t)
  46 {
  47         t->magic        = cpu_to_be32(t->magic);
  48         t->sequence     = cpu_to_be32(t->sequence);
  49         t->time         = cpu_to_be64(t->time);
  50         t->sector       = cpu_to_be64(t->sector);
  51         t->bytes        = cpu_to_be32(t->bytes);
  52         t->action       = cpu_to_be32(t->action);
  53         t->pid          = cpu_to_be32(t->pid);
  54         t->error        = cpu_to_be16(t->error);
  55         t->pdu_len      = cpu_to_be16(t->pdu_len);
  56 }
  57
  58 static inline void trace_to_cpu(struct blk_io_trace *t)
  59 {
  60         t->magic        = be32_to_cpu(t->magic);
  61         t->sequence     = be32_to_cpu(t->sequence);
  62         t->time         = be64_to_cpu(t->time);
  63         t->sector       = be64_to_cpu(t->sector);
  64         t->bytes        = be32_to_cpu(t->bytes);
  65         t->action       = be32_to_cpu(t->action);
  66         t->pid          = be32_to_cpu(t->pid);
  67         t->error        = be16_to_cpu(t->error);
  68         t->pdu_len      = be16_to_cpu(t->pdu_len);
  69 }
  70
  71 #endif