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 14:37:48 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Niels de Vos <ndevos@...hat.com>,
	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 Tue, Jan 31, 2012 at 11:32:50AM -0800, Andrew Morton wrote:
> I didn't say the kernel would support this as-is.
> 
> If the partitioning scheme requires writing to the individual
> partitions then something would need to be done, such as a simple
> offsetting DM driver.

Writing partition tables requires writing to them main block device.

Seriously - if people want to support block devices nodes > 16TB dealing
with this isn't the problem.  They'll need to find a way to do buffered
I/O without using the pagecache to get it right, at which point
blkdev_get_block in either form will simply go away.
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