f27aaf4b53
RBD is an block driver for the distributed file system Ceph (http://ceph.newdream.net/). This driver uses librados (which is part of the Ceph server) for direct access to the Ceph object store and is running entirely in userspace (Yehuda also wrote a driver for the linux kernel, that can be used to access rbd volumes as a block device). Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net> Signed-off-by: Christian Brunner <chb@muc.de> Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
72 lines
1.7 KiB
C
72 lines
1.7 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.LIB.
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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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/*
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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_MAX_OBJ_NAME_SIZE 96
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#define RBD_MAX_BLOCK_NAME_SIZE 24
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#define RBD_MAX_SEG_NAME_SIZE 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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uint64_t max_id;
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} __attribute__ ((packed));
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struct rbd_obj_snap_ondisk {
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uint64_t id;
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uint64_t image_size;
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} __attribute__((packed));
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struct rbd_obj_header_ondisk {
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char text[40];
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char block_name[RBD_MAX_BLOCK_NAME_SIZE];
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char signature[4];
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char version[8];
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struct {
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uint8_t order;
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uint8_t crypt_type;
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uint8_t comp_type;
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uint8_t unused;
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} __attribute__((packed)) options;
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uint64_t image_size;
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uint64_t snap_seq;
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uint32_t snap_count;
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uint32_t reserved;
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uint64_t snap_names_len;
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struct rbd_obj_snap_ondisk snaps[0];
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} __attribute__((packed));
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#endif
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