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Date:	Sat, 14 Nov 2009 09:12:30 +0800
From:	Herbert Xu <>
To:	Gregory Haskins <>
Cc:	"Michael S. Tsirkin" <>,,,
Subject: Re: [RFC PATCH] net: add dataref destructor to sk_buff

On Tue, Nov 10, 2009 at 10:45:16AM -0500, Gregory Haskins wrote:
> What I am getting at is as follows:  From a real basic perspective, you
> can look at all of this as a simple synchronous call (i.e. sendmsg()).
> The "app" (be it a userspace app, or a guest) prepares a buffer for
> transmission, and offers it to the next layer in the stack.  The app
> must maintain the integrity of that buffer at least until the layer
> below it signifies that it is "consumed".  This may mean its a
> synchronous call, like sendmsg(), or it may be asynchronous, like AIO.

Neither sendmsg() nor sendfile() is synchronous in the way you

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