|Subject:||Re: [Qemu-devel] buffer alignment for block backends|
|Date:||Thu, 09 Apr 2009 11:28:37 -0500|
|User-agent:||Thunderbird 220.127.116.11 (X11/20090320)|
Gerd Hoffmann wrote:
The xen block protocol can handle unaligned requests just fine.Not completely arbitrarily aligned requests. They need to be sector-aligned.Agreed. Sector-alignment you have anyway, thats why I didn't wrote that explicitly.
But even sector-alignment is not guaranteed for the buffers in the bdrv_* API.
You can implement a backend that just implements aio_read/aio_write and you'll always get sector-aligned offsets, but the actual data buffers may have any alignment.
Regards, Anthony Liguori
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