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Re: [PATCH RFC] xfs: set block device logical sector size on xfs_buftarg

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [PATCH RFC] xfs: set block device logical sector size on xfs_buftarg
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Thu, 14 Nov 2013 05:37:49 -0800
Cc: Eric Sandeen <sandeen@xxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Eric Sandeen <sandeen@xxxxxxxxxx>, xfs-oss <xfs@xxxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20131113212658.GJ6188@dastard>
References: <5283C41D.7070503@xxxxxxxxxx> <20131113185645.GA20869@xxxxxxxxxxxxx> <5283CE2E.2070702@xxxxxxxxxxx> <20131113212658.GJ6188@dastard>
User-agent: Mutt/1.5.21 (2010-09-15)
On Thu, Nov 14, 2013 at 08:26:58AM +1100, Dave Chinner wrote:
> Seems like that's the avenue for improvement here to me. i.e. expose
> the correct values to the guest so it's mkfs does the right thing.
> Or, alternatively, make qemu buffer non-aligned/sized IOs itself
> internally.

I've implemented the support to expose these to the guest in qemu
years ago.  But the problem remains that this is information which
needs to be attached to the image, which can't really work with raw
images, and no one has bother to implement the support to store it
for say qcow2.

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