include/elliptics/core.h

   1 /*
   2  * 2008+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
   3  * All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #ifndef __DNET_CORE_H
  17 #define __DNET_CORE_H
  18
  19 #define DNET_HISTORY_SUFFIX     ".history"
  20 #define DNET_META_SUFFIX        "\0meta"
  21
  22 #ifdef CONFIG_ID_SIZE
  23 #define DNET_ID_SIZE            CONFIG_ID_SIZE
  24 #else
  25 #define DNET_ID_SIZE            64
  26 #endif
  27 #define DNET_MAX_NAME_LEN       64
  28
  29 /*
  30  * Each read transaction reply is being split into
  31  * chunks of this bytes max, thus reading transaction
  32  * callback will be invoked multiple times.
  33  */
  34 #define DNET_MAX_TRANS_SIZE     (1024*1024*10)
  35
  36 /*
  37  * When IO request is less than this constant,
  38  * system copies data into contiguous block with headers
  39  * and sends it using single syscall.
  40  */
  41 #define DNET_COPY_IO_SIZE       512
  42
  43 #ifndef HAVE_LARGEFILE_SUPPORT
  44 #define O_LARGEFILE             0
  45 #endif
  46
  47 #ifdef __GNUC__
  48 #define DNET_LOG_CHECK  __attribute__ ((format(printf, 3, 4)))
  49 #else
  50 #define DNET_LOG_CHECK
  51 #endif
  52
  53 #define ALIGN(x,a)              __ALIGN_MASK(x,(typeof(x))(a)-1)
  54 #define __ALIGN_MASK(x,mask)    (((x)+(mask))&~(mask))
  55
  56 /*
  57  * Default notify hash table size.
  58  */
  59 #define DNET_DEFAULT_NOTIFY_HASH_SIZE   256
  60
  61 /*
  62  * Default check timeout in seconds.
  63  */
  64 #define DNET_DEFAULT_CHECK_TIMEOUT_SEC  60
  65
  66 #define DNET_DEFAULT_STALL_TRANSACTIONS 5
  67
  68 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
  69
  70 #undef offsetof
  71 #ifdef __compiler_offsetof
  72 #define offsetof(TYPE,MEMBER) __compiler_offsetof(TYPE,MEMBER)
  73 #else
  74 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
  75 #endif
  76
  77 /* checksum size, must be enough to store sha512 hash */
  78 #define DNET_CSUM_SIZE          64
  79
  80 /* kernel (pohmelfs) provides own defines for byteorder changes */
  81 #ifndef __KERNEL__
  82 #ifdef WORDS_BIGENDIAN
  83
  84 #define dnet_bswap16(x)         ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8))
  85
  86 #define dnet_bswap32(x) \
  87      ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >>  8) |               \
  88       (((x) & 0x0000ff00) <<  8) | (((x) & 0x000000ff) << 24))
  89
  90 #define dnet_bswap64(x) \
  91      ((((x) & 0xff00000000000000ull) >> 56)                                   \
  92       | (((x) & 0x00ff000000000000ull) >> 40)                                 \
  93       | (((x) & 0x0000ff0000000000ull) >> 24)                                 \
  94       | (((x) & 0x000000ff00000000ull) >> 8)                                  \
  95       | (((x) & 0x00000000ff000000ull) << 8)                                  \
  96       | (((x) & 0x0000000000ff0000ull) << 24)                                 \
  97       | (((x) & 0x000000000000ff00ull) << 40)                                 \
  98       | (((x) & 0x00000000000000ffull) << 56))
  99 #else
 100 #define dnet_bswap16(x) (x)
 101 #define dnet_bswap32(x) (x)
 102 #define dnet_bswap64(x) (x)
 103 #endif
 104 #endif
 105
 106 #endif /* __DNET_CORE_H */