Date: Fri, 12 Dec 2008 08:48:50 +0100
From: Jean Delvare <khali@linux-fr.org>
To: Jens Axboe <jens.axboe@oracle.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>,
       LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] block: Fix LSF default inconsistency
Message-ID: <20081212084850.1b56529f@hyperion.delvare>
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Hi Jens,

On Thu, 11 Dec 2008 13:50:01 +0100, Jens Axboe wrote:
> Oh right, that's pretty dumb. Lets just do the former, then a later
> patch can replace it completely if wanted.
> 
> diff --git a/block/Kconfig b/block/Kconfig
> index 1ab7c15..a785e65 100644
> --- a/block/Kconfig
> +++ b/block/Kconfig
> @@ -23,22 +23,22 @@ menuconfig BLOCK
>  
>  if BLOCK
>  
> +config LSF
> +	bool
> +
>  config LBD
> -	bool "Support for Large Block Devices"
> +	bool "Support for Large Block Devices and files"

It might be the right time to drop the extra capital letters, for
consistency.

>  	depends on !64BIT
> +	select LSF
>  	help
> -	  Enable block devices of size 2TB and larger.
> +	  Enable block devices or files of size 2TB and larger.
>  
>  	  This option is required to support the full capacity of large
>  	  (2TB+) block devices, including RAID, disk, Network Block Device,
>  	  Logical Volume Manager (LVM) and loopback.
> -
> -	  For example, RAID devices are frequently bigger than the capacity
> -	  of the largest individual hard drive.
> -
> -	  This option is not required if you have individual disk drives
> -	  which total 2TB+ and you are not aggregating the capacity into
> -	  a large block device (e.g. using RAID or LVM).
> +	
> +	  This option also enables support for single files larger than
> +	  2TB.
>  
>  	  If unsure, say N.
>  
> @@ -57,15 +57,6 @@ config BLK_DEV_IO_TRACE
>  
>  	  If unsure, say N.
>  
> -config LSF
> -	bool "Support for Large Single Files"
> -	depends on !64BIT
> -	help
> -	  Say Y here if you want to be able to handle very large files (2TB
> -	  and larger), otherwise say N.
> -
> -	  If unsure, say Y.
> -
>  config BLK_DEV_BSG
>  	bool "Block layer SG support v4 (EXPERIMENTAL)"
>  	depends on EXPERIMENTAL
> 

Acked-by: Jean Delvare <khali@linux-fr.org>

As a side note, someone will have to tell me why changing the value of
option LSF triggers a full kernel rebuild.

-- 
Jean Delvare
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