linux-kernel - Re: [PATCH v3] fs: Invalidate the cache for a parent block-device if fsync() is called for a partition

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Date:	Tue, 31 Jan 2012 16:00:44 +0000
From:	Niels de Vos <ndevos@...hat.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Al Viro <viro@...iv.linux.org.uk>,
	Mikulas Patocka <mpatocka@...hat.com>,
	Jeff Moyer <jmoyer@...hat.com>,
	"Bryn M. Reeves" <bmr@...hat.com>
Subject: Re: [PATCH v3] fs: Invalidate the cache for a parent block-device
 if fsync() is called for a partition

On 01/26/2012 09:45 PM, Christoph Hellwig wrote:
> On Thu, Jan 26, 2012 at 01:40:51PM -0800, Andrew Morton wrote:
>> The Right Thing To Do here is to make the kernel behave logically and
>> predictably, then modify the userspace tools.  But if we're modifying
>> the userspace tools then we would just change userspace to issue a
>> BLKFLSBUF to /dev/sda and leave the kernel alone.
> 
> The right fix is to make partition and whole disk access coherent,
> which is fairly simply:
> 
>  - create the block device inode/mapping per gendisk, and only reference
>    count it per block_device
>  - make sure blkdev_get_block(s) applies the correct offset if used on
>    partitions
> 

This surely looks like a better way to fix this issue. I am not sure yet
how much work that would involve and if I am the right person to fix
this. If nobody beats me to it, I might send a patch for review some
(undefined) time later.

Thanks for the suggestions,
Niels
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