linux-ext4 - Re: [PATCH 02/18] xstat: Add a pair of system calls to make extended file stats available [ver #6]

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Date:	Thu, 22 Jul 2010 14:17:50 +0200
From:	Volker Lendecke <Volker.Lendecke@...Net.DE>
To:	David Howells <dhowells@...hat.com>
Cc:	Jan Engelhardt <jengelh@...ozas.de>, linux-cifs@...r.kernel.org,
	linux-nfs@...r.kernel.org, samba-technical@...ts.samba.org,
	linux-kernel@...r.kernel.org, viro@...IV.linux.org.uk,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 02/18] xstat: Add a pair of system calls to make
 extended file stats available [ver #6]

On Thu, Jul 22, 2010 at 01:14:47PM +0100, David Howells wrote:
> Jan Engelhardt <jengelh@...ozas.de> wrote:
> 
> > Linux already has a creation time field, it's called otime (there is no "b"
> > in "creation"), and you will find scattered fragments of that all over the
> > kernel (foremost, fs/jfs/, now btrfs, and I also notice sysvipc having
> > something with that name).
> 
> It is?  It's called crtime in Ext4.  st_btime, however, would be compatible
> with BSD's stat, and Samba would just use it by way of autoconf magic if it
> appeared.

Samba has the following check:

# recent FreeBSD, NetBSD have creation timestamps called birthtime:             
AC_CHECK_MEMBERS([struct stat.st_birthtimespec.tv_nsec])
AC_CHECK_MEMBERS([struct stat.st_birthtime], AC_CHECK_MEMBERS([struct stat.st_birthtimensec]))

and the supporting code around that. "birth" might also be
where the "b" comes from :-)

Volker
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