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drivers/block/rbd_types.h
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/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2004-2010 Sage Weil <sage@newdream.net>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#ifndef CEPH_RBD_TYPES_H
#define CEPH_RBD_TYPES_H
#include <linux/types.h>
/* For format version 2, rbd image 'foo' consists of objects
* rbd_id.foo - id of image
* rbd_header.<id> - image metadata
* rbd_data.<id>.0000000000000000
* rbd_data.<id>.0000000000000001
* ... - data
* Clients do not access header data directly in rbd format 2.
*/
#define RBD_HEADER_PREFIX "rbd_header."
#define RBD_ID_PREFIX "rbd_id."
#define RBD_V2_DATA_FORMAT "%s.%016llx"
#define RBD_LOCK_NAME "rbd_lock"
#define RBD_LOCK_TAG "internal"
#define RBD_LOCK_COOKIE_PREFIX "auto"
enum rbd_notify_op {
RBD_NOTIFY_OP_ACQUIRED_LOCK = 0,
RBD_NOTIFY_OP_RELEASED_LOCK = 1,
RBD_NOTIFY_OP_REQUEST_LOCK = 2,
RBD_NOTIFY_OP_HEADER_UPDATE = 3,
};
/*
* For format version 1, rbd image 'foo' consists of objects
* foo.rbd - image metadata
* rb.<idhi>.<idlo>.<extra>.000000000000
* rb.<idhi>.<idlo>.<extra>.000000000001
* ... - data
* There is no notion of a persistent image id in rbd format 1.
*/
#define RBD_SUFFIX ".rbd"
#define RBD_V1_DATA_FORMAT "%s.%012llx"
#define RBD_DIRECTORY "rbd_directory"
#define RBD_INFO "rbd_info"
#define RBD_DEFAULT_OBJ_ORDER 22 /* 4MB */
#define RBD_MIN_OBJ_ORDER 16
#define RBD_MAX_OBJ_ORDER 30
#define RBD_HEADER_TEXT "<<< Rados Block Device Image >>>
"
#define RBD_HEADER_SIGNATURE "RBD"
#define RBD_HEADER_VERSION "001.005"
struct rbd_image_snap_ondisk {
__le64 id;
__le64 image_size;
} __attribute__((packed));
struct rbd_image_header_ondisk {
char text[40];
char object_prefix[24];
char signature[4];
char version[8];
struct {
__u8 order;
__u8 crypt_type;
__u8 comp_type;
__u8 unused;
} __attribute__((packed)) options;
__le64 image_size;
__le64 snap_seq;
__le32 snap_count;
__le32 reserved;
__le64 snap_names_len;
struct rbd_image_snap_ondisk snaps[0];
} __attribute__((packed));
#endif
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