linux-kernel - Re: [PATCH 8/8] rbd: introduce rados block device (rbd), based on libceph

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Date:	Sat, 14 Aug 2010 07:23:30 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Sage Weil <sage@...dream.net>
CC:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-scsi@...r.kernel.org, ceph-devel@...r.kernel.org, hch@....de,
	akpm@...ux-foundation.org, yehuda@...newdream.net
Subject: Re: [PATCH 8/8] rbd: introduce rados block device (rbd), based on
 libceph

On 08/13/10 20:29, Sage Weil wrote:
> On Fri, 13 Aug 2010, Randy Dunlap wrote:
>> On Fri, 13 Aug 2010 10:40:40 -0700 Sage Weil wrote:
>>
>>> From: Yehuda Sadeh <yehuda@...newdream.net>
>>>
>>> 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@...newdream.net>
>>> Signed-off-by: Sage Weil <sage@...dream.net>
>>> ---
>>>  MAINTAINERS               |    9 +
>>>  drivers/block/Kconfig     |   13 +
>>>  drivers/block/Makefile    |    1 +
>>>  drivers/block/rbd.c       | 1844 +++++++++++++++++++++++++++++++++++++++++++++
>>>  drivers/block/rbd_types.h |   73 ++
>>>  5 files changed, 1940 insertions(+), 0 deletions(-)
>>>  create mode 100644 drivers/block/rbd.c
>>>  create mode 100644 drivers/block/rbd_types.h
>>>
>>> diff --git a/MAINTAINERS b/MAINTAINERS
>>> index 5102922..cb34b1b 100644
>>> --- a/MAINTAINERS
>>> +++ b/MAINTAINERS
>>> @@ -4694,6 +4694,15 @@ 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@...newdream.net>
>>> +M:	Sage Weil <sage@...dream.net>
>>> +M:	ceph-devel@...r.kernel.org
>>> +S:	Supported
>>> +F:	drivers/block/rbd.c
>>> +F:	drivers/block/rbd_types.h
>>> +
>>>  RADEON FRAMEBUFFER DISPLAY DRIVER
>>>  M:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
>>>  L:	linux-fbdev@...r.kernel.org
>>> diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
>>> index de27768..708104b 100644
>>> --- a/drivers/block/Kconfig
>>> +++ b/drivers/block/Kconfig
>>> @@ -488,4 +488,17 @@ config BLK_DEV_HD
>>>  
>>>  	  If unsure, say N.
>>>  
>>> +config BLK_DEV_RBD
>>> +	tristate "Rados block device (RBD)"
>>> +	select CEPH_LIB
>>> +	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
>>
>> In linux-next of 20100813, I get:
>>
>> net/built-in.o: In function `read_partial_message_section':
>> messenger.c:(.text+0x6598b): undefined reference to `crc32c'
>> net/built-in.o: In function `read_partial_message_bio':
>> messenger.c:(.text+0x65a57): undefined reference to `crc32c'
>> net/built-in.o: In function `write_partial_msg_pages':
>> messenger.c:(.text+0x65e22): undefined reference to `crc32c'
>> net/built-in.o: In function `prepare_write_message':
>> messenger.c:(.text+0x66219): undefined reference to `crc32c'
>> messenger.c:(.text+0x66240): undefined reference to `crc32c'
>> net/built-in.o:messenger.c:(.text+0x66264): more undefined references to `crc32c' follow
>>
>> when CONFIG_INET is not enabled.  It looks like BLK_DEV_RBD needs to depend on
>> INET and possibly on BLOCK (I sent a patch for depends on BLOCK on 2010-aug-04
>> due to other build errors).
> 
> I see the problem: BLK_DEV_RBD and CEPH_FS both have 'select CEPH_LIB' and 
> CEPH_LIB depends on INET and selects LIBCRC32C, but kconfig doesn't 
> propagate those backward dependencies for you.  It looks like CEPH_FS and 
> BLK_DEV_RBD should then depend on/select CEPH_LIB _and_ its dependencies.  
> Patching that (and the BLOCK dependency) up now...
> 
> Unless there is a better way to do it?

Not currently, so that is what it needs.
Thanks.

> Thanks!
> sage
> 
> 
> diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
> index 708104b..4a6e1b7 100644
> --- a/drivers/block/Kconfig
> +++ b/drivers/block/Kconfig
> @@ -490,7 +490,10 @@ config BLK_DEV_HD
>  
>  config BLK_DEV_RBD
>  	tristate "Rados block device (RBD)"
> +	depends on INET && EXPERIMENTAL && BLOCK
>  	select CEPH_LIB
> +	select LIBCRC32C
> +	select CRYPTO_AES
>  	default n
>  	help
>  	  Say Y here if you want include the Rados block device, which stripes
> diff --git a/fs/ceph/Kconfig b/fs/ceph/Kconfig
> index 89f9718..73a7b31 100644
> --- a/fs/ceph/Kconfig
> +++ b/fs/ceph/Kconfig
> @@ -1,9 +1,9 @@
>  config CEPH_FS
>          tristate "Ceph distributed file system (EXPERIMENTAL)"
>  	depends on INET && EXPERIMENTAL
> +	select CEPH_LIB
>  	select LIBCRC32C
>  	select CRYPTO_AES
> -	select CEPH_LIB
>  	default n
>  	help
>  	  Choose Y or M here to include support for mounting the


-- 
~Randy
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