netdev - Re: [PATCH v2 0/4] bugfix: Introduce sendpages_ok() to check sendpage

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Date: Wed, 5 Jun 2024 09:27:42 +0200
From: Christoph Hellwig <hch@....de>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Christoph Hellwig <hch@....de>, Ofir Gal <ofir.gal@...umez.com>,
	davem@...emloft.net, linux-block@...r.kernel.org,
	linux-nvme@...ts.infradead.org, netdev@...r.kernel.org,
	ceph-devel@...r.kernel.org, dhowells@...hat.com,
	edumazet@...gle.com, pabeni@...hat.com, kbusch@...nel.org,
	axboe@...nel.dk, sagi@...mberg.me, philipp.reisner@...bit.com,
	lars.ellenberg@...bit.com, christoph.boehmwalder@...bit.com,
	idryomov@...il.com, xiubli@...hat.com
Subject: Re: [PATCH v2 0/4] bugfix: Introduce sendpages_ok() to check
 sendpage_ok() on contiguous pages

On Tue, Jun 04, 2024 at 07:42:24AM -0700, Jakub Kicinski wrote:
> I'd guess the thinking was that if we push back the callers would
> switch the relevant allocations to be page-backed. But we can add
> a comment above the helper that says "you'd be better off using
> page frags and calling sendmsg(MSG_SPLICE_PAGES) directly".

That's just not how network block devices or file systems work, they
don't control the allocations and need to take what gets fed to them.