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Commit 602adf40 authored by Yehuda Sadeh's avatar Yehuda Sadeh Committed by Sage Weil
Browse files

rbd: introduce rados block device (rbd), based on libceph 



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: default avatarYehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: default avatarSage Weil <sage@newdream.net>
parent 3d14c5d2

MAINTAINERS

+9 −0
Original line number Diff line number Diff line
@@ -4807,6 +4807,15 @@ F: fs/qnx4/ 
F:	include/linux/qnx4_fs.h

F:	include/linux/qnxtypes.h



RADOS BLOCK DEVICE (RBD)

F:	include/linux/qnxtypes.h

M:	Yehuda Sadeh <yehuda@hq.newdream.net>

M:	Sage Weil <sage@newdream.net>

M:	ceph-devel@vger.kernel.org

S:	Supported

F:	drivers/block/rbd.c

F:	drivers/block/rbd_types.h



RADEON FRAMEBUFFER DISPLAY DRIVER

M:	Benjamin Herrenschmidt <benh@kernel.crashing.org>

L:	linux-fbdev@vger.kernel.org

drivers/block/Kconfig

+17 −0
Original line number Diff line number Diff line
@@ -488,4 +488,21 @@ config BLK_DEV_HD 


	  If unsure, say N.



config BLK_DEV_RBD

	tristate "Rados block device (RBD)"

	depends on INET && EXPERIMENTAL && BLOCK

	select CEPH_LIB

	select LIBCRC32C

	select CRYPTO_AES

	select CRYPTO

	default n

	help

	  Say Y here if you want include the Rados block device, which stripes

	  a block device over objects stored in the Ceph distributed object

	  store.



	  More information at http://ceph.newdream.net/.



	  If unsure, say N.



endif # BLK_DEV

drivers/block/Makefile

+1 −0
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@@ -37,5 +37,6 @@ obj-$(CONFIG_BLK_DEV_HD) += hd.o 


obj-$(CONFIG_XEN_BLKDEV_FRONTEND)	+= xen-blkfront.o

obj-$(CONFIG_BLK_DEV_DRBD)     += drbd/

obj-$(CONFIG_BLK_DEV_RBD)     += rbd.o



swim_mod-objs	:= swim.o swim_asm.o

drivers/block/rbd.c

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+1843 −0

File added.

Preview size limit exceeded, changes collapsed.

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>



/*

 * rbd image 'foo' consists of objects

 *   foo.rbd      - image metadata

 *   foo.00000000

 *   foo.00000001

 *   ...          - data

 */



#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_MAX_OBJ_NAME_LEN	96

#define RBD_MAX_SEG_NAME_LEN	128



#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_info {

	__le64 max_id;

} __attribute__ ((packed));



struct rbd_image_snap_ondisk {

	__le64 id;

	__le64 image_size;

} __attribute__((packed));



struct rbd_image_header_ondisk {

	char text[40];

	char block_name[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