From: Avi Kivity <avi@redhat.com>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] honor IDE_DMA_BUF_SECTORS
Date: Fri, 27 Mar 2009 13:58:20 +0300 [thread overview]
Message-ID: <49CCB14C.1080607@redhat.com> (raw)
In-Reply-To: <20090327103628.GF5408@const.bordeaux.inria.fr>
Samuel Thibault wrote:
>> But posix read/write does not fit how DMA works. A request should
>> either complete fully, or fail, leaving the destination (disk or
>> memory) in an undefined state.
>>
>
> Sure. Again, please read what _I_ wrote: I'm not proposing to expose
> that into DMA, just make it genericly handled in the block layer.
Okay. I oppose making short reads part of the API. Callers should
expect the return code to be either zero, or a failure indication.
If you want generic block layer support, it could come in the form of
helpers, that is a block format driver could call
bdrv_continue_partial_request(lots, of, parameters) to have the helper
advance the iovec and reissue the partially completed request.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
next prev parent reply other threads:[~2009-03-27 10:57 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-25 13:45 [Qemu-devel] [PATCH] honor IDE_DMA_BUF_SECTORS Stefano Stabellini
2009-03-25 15:22 ` Avi Kivity
2009-03-25 16:19 ` Stefano Stabellini
2009-03-25 16:45 ` Avi Kivity
2009-03-25 16:50 ` Stefano Stabellini
2009-03-25 17:47 ` Stefano Stabellini
2009-03-26 10:23 ` Avi Kivity
2009-03-26 10:31 ` Stefano Stabellini
2009-03-26 10:57 ` Avi Kivity
2009-03-26 11:45 ` Stefano Stabellini
2009-03-26 12:10 ` Avi Kivity
2009-03-26 12:28 ` Stefano Stabellini
2009-03-26 12:47 ` Samuel Thibault
2009-03-26 12:58 ` Avi Kivity
2009-03-26 15:30 ` Samuel Thibault
2009-03-26 18:32 ` Avi Kivity
2009-03-26 18:48 ` Samuel Thibault
2009-03-26 19:40 ` Avi Kivity
2009-03-26 23:18 ` Samuel Thibault
2009-03-27 9:52 ` Avi Kivity
2009-03-27 10:32 ` Samuel Thibault
2009-03-27 10:53 ` Avi Kivity
2009-03-27 13:45 ` Samuel Thibault
2009-03-26 22:42 ` Christoph Hellwig
2009-03-26 23:22 ` Samuel Thibault
2009-03-27 10:02 ` Avi Kivity
2009-03-27 10:36 ` Samuel Thibault
2009-03-27 10:58 ` Avi Kivity [this message]
2009-03-25 16:46 ` Samuel Thibault
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