netdev - Re: [RFC PATCH 1/4] splice: Fix corruption of spliced data after splice() returns

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Message-ID: <63041.1690191864@warthog.procyon.org.uk>
Date: Mon, 24 Jul 2023 10:44:24 +0100
From: David Howells <dhowells@...hat.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: dhowells@...hat.com, Matthew Wilcox <willy@...radead.org>,
    Miklos Szeredi <miklos@...redi.hu>,
    Matt Whitlock <kernel@...twhitlock.name>, netdev@...r.kernel.org,
    Dave Chinner <david@...morbit.com>, Jens Axboe <axboe@...nel.dk>,
    linux-fsdevel@...ck.org, linux-mm@...ck.org,
    linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
    linux-fsdevel@...r.kernel.org
Subject: Re: [RFC PATCH 1/4] splice: Fix corruption of spliced data after splice() returns

Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> > So what's the API that provides the semantics of _copying_?
> 
> It's called "read()" and "write()".

What about copy_file_range()?  That seems to fall back to splicing if not
directly implemented by the filesystem.  It looks like the manpage for that
needs updating too - or should that actually copy?

David