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![Yehuda Sadeh](/assets/img/avatar_default.png)
The rados block device (rbd), based on osdblk, creates a block device that is backed by objects stored in the Ceph distributed object storage cluster. Each device consists of a single metadata object and data striped over many data objects. The rbd driver supports read-only snapshots. Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Sage Weil <sage@newdream.net>
73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
/*
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* Ceph - scalable distributed file system
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*
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* Copyright (C) 2004-2010 Sage Weil <sage@newdream.net>
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*
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* This is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License version 2.1, as published by the Free Software
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* Foundation. See file COPYING.
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*
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*/
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#ifndef CEPH_RBD_TYPES_H
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#define CEPH_RBD_TYPES_H
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#include <linux/types.h>
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/*
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* rbd image 'foo' consists of objects
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* foo.rbd - image metadata
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* foo.00000000
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* foo.00000001
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* ... - data
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*/
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#define RBD_SUFFIX ".rbd"
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#define RBD_DIRECTORY "rbd_directory"
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#define RBD_INFO "rbd_info"
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#define RBD_DEFAULT_OBJ_ORDER 22 /* 4MB */
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#define RBD_MIN_OBJ_ORDER 16
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#define RBD_MAX_OBJ_ORDER 30
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#define RBD_MAX_OBJ_NAME_LEN 96
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#define RBD_MAX_SEG_NAME_LEN 128
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#define RBD_COMP_NONE 0
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#define RBD_CRYPT_NONE 0
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#define RBD_HEADER_TEXT "<<< Rados Block Device Image >>>\n"
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#define RBD_HEADER_SIGNATURE "RBD"
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#define RBD_HEADER_VERSION "001.005"
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struct rbd_info {
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__le64 max_id;
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} __attribute__ ((packed));
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struct rbd_image_snap_ondisk {
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__le64 id;
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__le64 image_size;
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} __attribute__((packed));
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struct rbd_image_header_ondisk {
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char text[40];
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char block_name[24];
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char signature[4];
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char version[8];
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struct {
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__u8 order;
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__u8 crypt_type;
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__u8 comp_type;
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__u8 unused;
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} __attribute__((packed)) options;
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__le64 image_size;
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__le64 snap_seq;
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__le32 snap_count;
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__le32 reserved;
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__le64 snap_names_len;
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struct rbd_image_snap_ondisk snaps[0];
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} __attribute__((packed));
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#endif
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