block/rbd_types.h

   1 /*
   2  * Ceph - scalable distributed file system
   3  *
   4  * Copyright (C) 2004-2010 Sage Weil <sage@newdream.net>
   5  *
   6  * This is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License version 2.1, as published by the Free Software
   9  * Foundation.  See file COPYING.LIB.
  10  *
  11  */
  12
  13 #ifndef CEPH_RBD_TYPES_H
  14 #define CEPH_RBD_TYPES_H
  15
  16
  17 /*
  18  * rbd image 'foo' consists of objects
  19  *   foo.rbd      - image metadata
  20  *   foo.00000000
  21  *   foo.00000001
  22  *   ...          - data
  23  */
  24
  25 #define RBD_SUFFIX              ".rbd"
  26 #define RBD_DIRECTORY           "rbd_directory"
  27 #define RBD_INFO                "rbd_info"
  28
  29 #define RBD_DEFAULT_OBJ_ORDER   22   /* 4MB */
  30
  31 #define RBD_MAX_OBJ_NAME_SIZE   96
  32 #define RBD_MAX_BLOCK_NAME_SIZE 24
  33 #define RBD_MAX_SEG_NAME_SIZE   128
  34
  35 #define RBD_COMP_NONE           0
  36 #define RBD_CRYPT_NONE          0
  37
  38 #define RBD_HEADER_TEXT         "<<< Rados Block Device Image >>>\n"
  39 #define RBD_HEADER_SIGNATURE    "RBD"
  40 #define RBD_HEADER_VERSION      "001.005"
  41
  42 struct rbd_info {
  43     uint64_t max_id;
  44 } __attribute__ ((packed));
  45
  46 struct rbd_obj_snap_ondisk {
  47     uint64_t id;
  48     uint64_t image_size;
  49 } __attribute__((packed));
  50
  51 struct rbd_obj_header_ondisk {
  52     char text[40];
  53     char block_name[RBD_MAX_BLOCK_NAME_SIZE];
  54     char signature[4];
  55     char version[8];
  56     struct {
  57         uint8_t order;
  58         uint8_t crypt_type;
  59         uint8_t comp_type;
  60         uint8_t unused;
  61     } __attribute__((packed)) options;
  62     uint64_t image_size;
  63     uint64_t snap_seq;
  64     uint32_t snap_count;
  65     uint32_t reserved;
  66     uint64_t snap_names_len;
  67     struct rbd_obj_snap_ondisk snaps[0];
  68 } __attribute__((packed));
  69
  70
  71 #endif