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

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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>
This commit is contained in:
Yehuda Sadeh 2010-08-12 16:11:25 -07:00 committed by Sage Weil
parent 3d14c5d2b6
commit 602adf4002
6 changed files with 1944 additions and 2 deletions
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9
MAINTAINERS
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@ -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

17
drivers/block/Kconfig
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@ -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

1
drivers/block/Makefile
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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

1843
drivers/block/rbd.c Normal file
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File diff suppressed because it is too large Load Diff

73
drivers/block/rbd_types.h Normal file
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@ -0,0 +1,73 @@
/*
* 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

3
net/ceph/debugfs.c
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@ -252,8 +252,7 @@ void ceph_debugfs_cleanup(void)
{
}
int ceph_debugfs_client_init(struct ceph_client *client,
int (*module_debugfs_init)(struct ceph_client *))
int ceph_debugfs_client_init(struct ceph_client *client)
{
return 0;
}