Re: [Qemu-devel] [PATCH] For AIO return -ENOSPC on short write

[Kevin Wolf <kwolf@redhat.com>]

Am 22.02.2011 16:02, schrieb Stefan Hajnoczi:
> On Tue, Feb 22, 2011 at 10:18 AM,  <Jes.Sorensen@redhat.com> wrote:
>> +        else if ((laiocb->type == QEMU_AIO_WRITE) && (ret >= 0) &&
>> +                 (ret < laiocb->nbytes))
>> +            ret = -ENOSPC;
> 
> Why is write special?

I think we need the change reads, too. However not to return ENOSPC, but
to return zeros instead (this is what the synchronous raw_read does, and
pwrite relies on it - once we make pwrite async, we'll need this).

> Why are we even allowing requests that extend beyond the end of the
> device?  Is the LVM volume marked growable in the QEMU block layer?

Might well be a qcow2 on LVM case that Jes was debugging.

Kevin