linux-kernel - Re: [PATCH 1/6] statx: Add a system call to make enhanced file info available

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Message-ID: <25305.1463996013@warthog.procyon.org.uk>
Date:	Mon, 23 May 2016 10:33:33 +0100
From:	David Howells <dhowells@...hat.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	dhowells@...hat.com, Arnd Bergmann <arnd@...db.de>,
	linux-fsdevel@...r.kernel.org, linux-afs@...ts.infradead.org,
	linux-nfs@...r.kernel.org, samba-technical@...ts.samba.org,
	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/6] statx: Add a system call to make enhanced file info available

Christoph Hellwig <hch@...radead.org> wrote:

> Honestly I think this really matters on the amount of 'emulation' we
> need - if it's just adding a new flag that can be trivially generated
> in the syscall stub in userland that's probably fine, but if we have
> actually differing semantics (like the stat weak attributes) I'd rather
> have a properly documented syscall.  If we otherwise need to rewrite
> whole structures I'd much rather do that in kernel space.

I very much agree.

> And to get back to stat: if would be really useful to coordinate the
> new one with glibc so that we don't end up with two different stat
> structures again like we do for a lot of platforms at the moment.

I've tried reaching out to them and others, but no one responded.

David