linux-kernel - Re: Bug in BLKBSZSET/GET ioctl ?

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Date:	Thu, 29 Dec 2011 11:56:27 +0800
From:	Wanlong Gao <gaowanlong@...fujitsu.com>
To:	unlisted-recipients:; (no To-header on input)
CC:	gaowanlong@...fujitsu.com, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, fengguang.wu@...el.com
Subject: Re: Bug in BLKBSZSET/GET ioctl ?

On 12/29/2011 11:51 AM, Wanlong Gao wrote:

> Hi all:
> 
> This is first reported to *libguestfs*: https://bugzilla.redhat.com/show_bug.cgi?id=624335


The blockdev-get/setbsz in *libguestfs* is just a wraper of util-linux's *blockdev --get/setbsz*.

> 
> Then, I looked into upstream util-linux and it seems nothing wrong. I'm not convinced that it's a kernel bug.
> 
> produce:
> 
> ---
> # ./util-linux/disk-utils/blockdev --getbsz /dev/sda6
> 4096
> # ./util-linux/disk-utils/blockdev --setbsz 2048 /dev/sda6
> # ./util-linux/disk-utils/blockdev --getbsz /dev/sda6
> 4096
> # ./util-linux/disk-utils/blockdev --setbsz 512 /dev/sda6
> # ./util-linux/disk-utils/blockdev --getbsz /dev/sda6
> 4096
> 
> ---
> 
> I'm not sure if it is related to write-back, but still CCed to Fengguang.
> 
> 
> 
> Thanks,
> -Wanlong Gao


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