linux-kernel - Re: [PATCH] staging/lustre: add BLOCK depends in Kconfig

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Date:	Fri, 26 Jul 2013 07:34:05 +0000
From:	"Dilger, Andreas" <andreas.dilger@...el.com>
To:	Xiong Zhou <jencce.kernel@...il.com>
CC:	Peng Tao <bergwolf@...il.com>, Jiri Kosina <trivial@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] staging/lustre: add BLOCK depends in Kconfig

On 2013/07/26 12:54 AM, "Xiong Zhou" <jencce.kernel@...il.com> wrote:

>2013/7/26 Dilger, Andreas <andreas.dilger@...el.com>:
>> On 2013/07/25 1:06 AM, "Xiong Zhou" <jencce.kernel@...il.com> wrote:
>>
>>>From: Xiong Zhou <jencce.kernel@...il.com>
>>>
>>>Add BLOCK depends in Kconfig for LUSTRE to fix this:
>>>drivers/staging/lustre/lustre/fid/../include/linux/lustre_compat25.h:117
>>>:2
>>>:
>>>error: implicit declaration of function ʽunregister_blkdevʼ
>>>
>>>Signed-off-by: Xiong Zhou <jencce.kernel@...il.com>
>>>---
>>> drivers/staging/lustre/lustre/Kconfig |    2 +-
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>>diff --git a/drivers/staging/lustre/lustre/Kconfig
>>>b/drivers/staging/lustre/lustre/Kconfig
>>>index 9ae7fa8..0b45de0 100644
>>>--- a/drivers/staging/lustre/lustre/Kconfig
>>>+++ b/drivers/staging/lustre/lustre/Kconfig
>>>@@ -1,6 +1,6 @@
>>> config LUSTRE_FS
>>>       tristate "Lustre file system client support"
>>>-      depends on STAGING && INET && m
>>>+      depends on STAGING && INET && BLOCK && m
>>>       select LNET
>>>       select CRYPTO
>>>       select CRYPTO_CRC32
>>
>> The Lustre client does not need a block device - it is a network
>> filesystem.
>> The one piece of code that is relevant here relates to a
>>Lustre-optimized
>> "loop" device that bypasses the VFS, data copying, and DLM locking for
>>use
>> by swap and such.  It would be better instead to make that code
>>conditional
>> and add a new CONFIG_LUSTRE_LLOOP or similar, and only make that part
>> dependent on BLOCK.
>
>This makes sence. I noticed that this patch has gone into Greg's tree,
>so a coming patch based on this patch is cool?

That would be fine, thanks.

Cheers, Andreas
-- 
Andreas Dilger

Lustre Software Architect
Intel High Performance Data Division