Re: [RFC PATCH] net: add dataref destructor to sk_buff

Gregory Haskins
2009-11-14T01:33:37Z

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Herbert Xu wrote:
> 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
> imagine.

Well, not with respect to the overall protocol, of course not. But with
respect to the buffer in question, it _has_ to be. Or am I missing
something?

Kind Regards,
-Greg

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