Re: [Qemu-devel] [PATCH v2 1/3] block: block: introduce bdrv_io_plug() and bdrv_io_unplug()

[Paolo Bonzini]

Il 02/07/2014 12:02, Ming Lei ha scritto:
> > > Actually linux-aio can support to submit read/write to multi files, and
> > > virtio-scsi does have the use case, so in future io queue should be
> > > per aio-context as I posted 1st time.  And I am wondering if multiwrite-like
> > > APIs can fit in this situation.
> >
> > Though where would you get the requests for two different files from,
> > within the same bdrv_plug/unplug block?
>
> I think it is doable if io queue is per aio_context.

Yes, but that would basically mean moving linux-aio functionality to 
AioContext.  Effectively it's a rewrite of linux-aio.c.

Paolo