linux-kernel - Re: [PATCHSET 0/2] Fix splice from random/urandom

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Date:   Fri, 20 May 2022 06:51:08 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Christoph Hellwig <hch@....de>
Cc:     tytso@....edu, Jason@...c4.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCHSET 0/2] Fix splice from random/urandom

On 5/20/22 12:02 AM, Christoph Hellwig wrote:
> On Thu, May 19, 2022 at 01:55:26PM -0600, Jens Axboe wrote:
>> I'm a bit torn on this one, because I _really_ want us to get rid of
>> read/write and make everything use read_iter/write_iter. Firstly because
>> it's really stupid to have two interfaces, and secondly because even
>> basic things like "can we block here" doesn't work in the older
>> interface without fiddling with file flags which is a non-starter for
>> certain things.
> 
> Converting everything was my initial plan, but Linus said no and just
> fix whatever breaks.  And compared to my initial fears the fallout
> actually isn't that bad.

That's a real shame, and very unlike Linus to advocate for just breaking
applications willy nilly. It would be a considerable amount of work
though, but it would really be great to not have ->read/->write anymore
and solely use the iter variants.

Not sure if I agree with "that bad" though looking at the number of
fixups, and we'll keep finding these going forward as well...

-- 
Jens Axboe