linux-kernel - Re: [RFC][PATCH 0/6] Enhanced file stat system call

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Message-ID: <CAH2r5muL336k178DJHxKByfbGMMc=_m5jsCctgRQCc1H+SRSQg@mail.gmail.com>
Date:	Thu, 5 May 2016 21:00:18 -0500
From:	Steve French <smfrench@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	David Howells <dhowells@...hat.com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-afs@...r.kernel.org,
	"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
	samba-technical <samba-technical@...ts.samba.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	Deepa Dinamani <deepa.kernel@...il.com>
Subject: Re: [RFC][PATCH 0/6] Enhanced file stat system call

On Thu, May 5, 2016 at 5:54 PM, Steve French <smfrench@...il.com> wrote:
> On Wed, May 4, 2016 at 8:46 AM, Arnd Bergmann <arnd@...db.de> wrote:
>> On Friday 29 April 2016 13:57:36 David Howells wrote:
>>> struct statx *buffer);
>>>
>>> This is an enhanced file stat function that provides a number of useful
>>> features, in summary:
>>>
>>> (1) More information: creation time, data version number, inode
>>> generation
>>> number and flags. A subset of these is available through a number of
>>> filesystems (such as CIFS, NFS, AFS, Ext4 and BTRFS).
>>>
>>
>> I have a question about birthtime/creationtime: As we are gaining a way
>> to read this, should we also provide a way to update it using a new
>> variant
>> of the utimensat syscall in order to have 'cp -a' create an identical
>> copy,
>> or is the idea that this is defined as the time that is particular copy
>> of the inode was created?
>>
>> I've discussed this with Deepa in the past, as she is driving the
>> convertion of the inode timestamps to timespec64 now, and we will
>> need a new version of utimensat for her work as well. I can see good
>> reasons either way (allowing updates of btime or disallowing them).
>
It would help interop with Windows (and presumably Mac) if birth time can be
updated



-- 
Thanks,

Steve