linux-kernel - Re: [PATCH] vfs: relax linkat() AT_EMPTY_PATH - aka flink()

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Date: Fri, 12 Apr 2024 10:56:14 +0200
From: Christian Brauner <brauner@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Alexander Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Andrew Lutomirski <luto@...nel.org>, Peter Anvin <hpa@...or.com>
Subject: Re: [PATCH] vfs: relax linkat() AT_EMPTY_PATH - aka flink() -
 requirements

On Thu, Apr 11, 2024 at 09:21:27AM -0700, Linus Torvalds wrote:
> On Thu, 11 Apr 2024 at 05:25, Christian Brauner <brauner@...nel.org> wrote:
> >
> > Btw, I think we should try to avoid putting this into path_init() and
> > confine this to linkat() itself imho. The way I tried to do it was by
> > presetting a root for filename_lookup(); means we also don't need a
> > LOOKUP_* flag for this as this is mostly a linkat thing.
> 
> So I had the exact reverse reaction to your patch - I felt that using

Fun. I really disliked the idea of having to somehow wrangle this into
lookup itself and that the root argument just happened to not be used
for non-kernel internal use-cases yet. But I'm not married to this so
fine by me.