LXR linux/drivers/block/rbd

   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/* For format version 2, rbd image 'foo' consists of objects
  19 *   rbd_id.foo         - id of image
  20 *   rbd_header.<id>    - image metadata
  21 *   rbd_object_map.<id> - optional image object map
  22 *   rbd_data.<id>.0000000000000000
  23 *   rbd_data.<id>.0000000000000001
  24 *   ...                - data
  25 * Clients do not access header data directly in rbd format 2.
  26 */
  27
  28#define RBD_HEADER_PREFIX      "rbd_header."
  29#define RBD_OBJECT_MAP_PREFIX  "rbd_object_map."
  30#define RBD_ID_PREFIX          "rbd_id."
  31#define RBD_V2_DATA_FORMAT     "%s.%016llx"
  32
  33#define RBD_LOCK_NAME          "rbd_lock"
  34#define RBD_LOCK_TAG           "internal"
  35#define RBD_LOCK_COOKIE_PREFIX "auto"
  36
  37enum rbd_notify_op {
  38        RBD_NOTIFY_OP_ACQUIRED_LOCK      = 0,
  39        RBD_NOTIFY_OP_RELEASED_LOCK      = 1,
  40        RBD_NOTIFY_OP_REQUEST_LOCK       = 2,
  41        RBD_NOTIFY_OP_HEADER_UPDATE      = 3,
  42};
  43
  44#define OBJECT_NONEXISTENT      0
  45#define OBJECT_EXISTS           1
  46#define OBJECT_PENDING          2
  47#define OBJECT_EXISTS_CLEAN     3
  48
  49#define RBD_FLAG_OBJECT_MAP_INVALID     (1ULL << 0)
  50#define RBD_FLAG_FAST_DIFF_INVALID      (1ULL << 1)
  51
  52/*
  53 * For format version 1, rbd image 'foo' consists of objects
  54 *   foo.rbd            - image metadata
  55 *   rb.<idhi>.<idlo>.<extra>.000000000000
  56 *   rb.<idhi>.<idlo>.<extra>.000000000001
  57 *   ...                - data
  58 * There is no notion of a persistent image id in rbd format 1.
  59 */
  60
  61#define RBD_SUFFIX              ".rbd"
  62#define RBD_V1_DATA_FORMAT      "%s.%012llx"
  63
  64#define RBD_DIRECTORY           "rbd_directory"
  65#define RBD_INFO                "rbd_info"
  66
  67#define RBD_DEFAULT_OBJ_ORDER   22   /* 4MB */
  68#define RBD_MIN_OBJ_ORDER       16
  69#define RBD_MAX_OBJ_ORDER       30
  70
  71#define RBD_HEADER_TEXT         "<<< Rados Block Device Image >>>\n"
  72#define RBD_HEADER_SIGNATURE    "RBD"
  73#define RBD_HEADER_VERSION      "001.005"
  74
  75struct rbd_image_snap_ondisk {
  76        __le64 id;
  77        __le64 image_size;
  78} __attribute__((packed));
  79
  80struct rbd_image_header_ondisk {
  81        char text[40];
  82        char object_prefix[24];
  83        char signature[4];
  84        char version[8];
  85        struct {
  86                __u8 order;
  87                __u8 crypt_type;
  88                __u8 comp_type;
  89                __u8 unused;
  90        } __attribute__((packed)) options;
  91        __le64 image_size;
  92        __le64 snap_seq;
  93        __le32 snap_count;
  94        __le32 reserved;
  95        __le64 snap_names_len;
  96        struct rbd_image_snap_ondisk snaps[0];
  97} __attribute__((packed));
  98
  99
 100#endif
 101