linux-kernel - Re: [PATCH] Ext4: Make file creation time, i_version and i

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Message-ID: <20100629225944.GA22924@samba1>
Date:	Tue, 29 Jun 2010 15:59:44 -0700
From:	Jeremy Allison <jra@...ba.org>
To:	David Howells <dhowells@...hat.com>
Cc:	Jeremy Allison <jra@...ba.org>, Steve French <smfrench@...il.com>,
	viro@...iv.linux.org.uk, jlayton@...hat.com, mcao@...ibm.com,
	aneesh.kumar@...ux.vnet.ibm.com, linux-cifs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	samba-technical@...ts.samba.org, sjayaraman@...e.de,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] Ext4: Make file creation time, i_version and
	i_generation available by xattrs

On Tue, Jun 29, 2010 at 11:44:37PM +0100, David Howells wrote:
> Jeremy Allison <jra@...ba.org> wrote:
> 
> > We already have code in Samba to detect "birthtime"
> > (st_btime) as a returned member of a stat struct.
> 
> Is it, though?
> 
> Googling for st_btime suggests it could also be taken as the time last
> archived.  That may just be a NetWareism though.

It's a *BSD'ism.

http://www.daemon-systems.org/man/fstat.2.html

     #if defined(_NETBSD_SOURCE)
         struct timespec st_birthtimespec;   /* time of inode creation */
     #else
         time_t    st_birthtime;             /* time of inode creation */
         long      st_birthtimensec;         /* nsec of inode creation */
     #endif

http://www.unix.com/man-page/FreeBSD/2/stat/

st_birthtime  Time when the inode was created.

Of course, for Samba's use we also have to be
able to *write* to st_birthtime as Windows clients
can change this. But that's what the EA is for
(and I'm happy with a system that can only read
st_birthtime, not write it).

Jeremy.
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