Re: maximum buffer size for splice(2) tcp->pipe?

[David Miller <davem@davemloft.net>]

From: Eric Dumazet <dada1@cosmosbay.com>
Date: Wed, 14 Jan 2009 00:38:32 +0100

> [PATCH] net: splice() from tcp to socket should take into account O_NONBLOCK
> 
> Instead of using SPLICE_F_NONBLOCK to select a non blocking mode both on
> source tcp socket and pipe destination, we use the underlying file flag (O_NONBLOCK)
> for selecting a non blocking socket.
> 
> Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>

This needs at least some more thought.

It seems, for one thing, that this change will interfere with the
intentions of the code in splice_dirt_to_actor which goes:

	/*
	 * Don't block on output, we have to drain the direct pipe.
	 */
	sd->flags &= ~SPLICE_F_NONBLOCK;