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

[Gregory Haskins]

Herbert Xu wrote:
> On Fri, Nov 13, 2009 at 08:33:35PM -0500, Gregory Haskins wrote:
>> 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?
> 
> sendfile() has never guaranteed that the kernel is finished with
> the underlying pages when it returns.
> 
> Cheers,

Clearly there must be _some_ mechanism to synchronize (e.g.
flush/barrier) though, right?  Otherwise, that interface would seem to
be quite prone to races and would likely be unusable.   So what does
said flush use to know when the buffer is free?

-Greg

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