drivers/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.
  10  *
  11  */
  12
  13 #ifndef CEPH_RBD_TYPES_H
  14 #define CEPH_RBD_TYPES_H
  15
  16 #include <linux/types.h>
  17
  18 /*
  19  * rbd image 'foo' consists of objects
  20  *   foo.rbd      - image metadata
  21  *   foo.00000000
  22  *   foo.00000001
  23  *   ...          - data
  24  */
  25
  26 #define RBD_SUFFIX              ".rbd"
  27 #define RBD_DIRECTORY           "rbd_directory"
  28 #define RBD_INFO                "rbd_info"
  29
  30 #define RBD_DEFAULT_OBJ_ORDER   22   /* 4MB */
  31 #define RBD_MIN_OBJ_ORDER       16
  32 #define RBD_MAX_OBJ_ORDER       30
  33
  34 #define RBD_MAX_OBJ_NAME_LEN    96
  35 #define RBD_MAX_SEG_NAME_LEN    128
  36
  37 #define RBD_COMP_NONE           0
  38 #define RBD_CRYPT_NONE          0
  39
  40 #define RBD_HEADER_TEXT         "<<< Rados Block Device Image >>>\n"
  41 #define RBD_HEADER_SIGNATURE    "RBD"
  42 #define RBD_HEADER_VERSION      "001.005"
  43
  44 struct rbd_info {
  45         __le64 max_id;
  46 } __attribute__ ((packed));
  47
  48 struct rbd_image_snap_ondisk {
  49         __le64 id;
  50         __le64 image_size;
  51 } __attribute__((packed));
  52
  53 struct rbd_image_header_ondisk {
  54         char text[40];
  55         char block_name[24];
  56         char signature[4];
  57         char version[8];
  58         struct {
  59                 __u8 order;
  60                 __u8 crypt_type;
  61                 __u8 comp_type;
  62                 __u8 unused;
  63         } __attribute__((packed)) options;
  64         __le64 image_size;
  65         __le64 snap_seq;
  66         __le32 snap_count;
  67         __le32 reserved;
  68         __le64 snap_names_len;
  69         struct rbd_image_snap_ondisk snaps[0];
  70 } __attribute__((packed));
  71
  72
  73 #endif