Re: [PATCH 22/23] fs: default to generic_file_splice_read for files having ->read_iter

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To: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH 22/23] fs: default to generic_file_splice_read for files having ->read_iter
From: Christoph Hellwig <hch@xxxxxx>
Date: Thu, 30 Jul 2020 18:31:42 +0200
Cc: Christoph Hellwig <hch@xxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>, Luis Chamberlain <mcgrof@xxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Iurii Zaikin <yzaikin@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx
In-reply-to: <20200730162219.GC1236603@ZenIV.linux.org.uk>
User-agent: Mutt/1.5.17 (2007-11-01)

On Thu, Jul 30, 2020 at 05:22:19PM +0100, Al Viro wrote:
> FWIW, none of the dubious (and outright broken) cases I've found go anywhere
> near that.  And it definitely won't help tun/tap...

Then I'm missing something obvious - what is the problem with tun/tap?

References:
- stop using ->read and ->write for kernel access v3
  - From: Christoph Hellwig
- [PATCH 22/23] fs: default to generic_file_splice_read for files having ->read_iter
  - From: Christoph Hellwig
- Re: [PATCH 22/23] fs: default to generic_file_splice_read for files having ->read_iter
  - From: Al Viro
- Re: [PATCH 22/23] fs: default to generic_file_splice_read for files having ->read_iter
  - From: Christoph Hellwig
- Re: [PATCH 22/23] fs: default to generic_file_splice_read for files having ->read_iter
  - From: Al Viro
- Re: [PATCH 22/23] fs: default to generic_file_splice_read for files having ->read_iter
  - From: Christoph Hellwig
- Re: [PATCH 22/23] fs: default to generic_file_splice_read for files having ->read_iter
  - From: Al Viro
- Re: [PATCH 22/23] fs: default to generic_file_splice_read for files having ->read_iter
  - From: Al Viro

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