Release 4.7 drivers/block/rbd_types.h

/*
 * 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_DATA_PREFIX        "rbd_data."

#define RBD_ID_PREFIX          "rbd_id."

/*
 * For format version 1, rbd image 'foo' consists of objects
 *   foo.rbd            - image metadata
 *   rb.<idhi>.<idlo>.00000000
 *   rb.<idhi>.<idlo>.00000001
 *   ...                - data
 * There is no notion of a persistent image id in rbd format 1.
 */


#define RBD_SUFFIX		".rbd"


#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_COMP_NONE		0

#define RBD_CRYPT_NONE		0


#define RBD_HEADER_TEXT		"<<< Rados Block Device Image >>>\n"

#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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Directory: drivers/block

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