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 13:02:49 +0300 [thread overview]
Message-ID: <49CCA449.4010504@redhat.com> (raw)
In-Reply-To: <20090326232230.GF5458@const.famille.thibault.fr>
Samuel Thibault wrote:
> Nothing in Linux makes filesystems and devices systematically read/write
> the amount of data that was requested.
>
>
We're talking about the qemu block layer, not Linux. You're proposing
to take the posix API rules and apply them to the qemu block layer. 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. Partial completions are impossible to implement
efficiently, and are a needless complication.
--
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 10:02 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 [this message]
2009-03-27 10:36 ` Samuel Thibault
2009-03-27 10:58 ` Avi Kivity
2009-03-25 16:46 ` Samuel Thibault
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