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From: Jeremy Allison <jra-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>
To: David Howells <dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: Jeremy Allison <jra-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>,
	Steve French <smfrench-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org,
	jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	mcao-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org,
	aneesh.kumar-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org,
	linux-cifs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	samba-technical-w/Ol4Ecudpl8XjKLYN78aQ@public.gmane.org,
	sjayaraman-l3A5Bk7waGM@public.gmane.org,
	linux-ext4-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH] Ext4: Make file creation time, i_version and i_generation available by xattrs
Date: Tue, 29 Jun 2010 15:59:44 -0700	[thread overview]
Message-ID: <20100629225944.GA22924@samba1> (raw)
In-Reply-To: <26197.1277851477-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

On Tue, Jun 29, 2010 at 11:44:37PM +0100, David Howells wrote:
> Jeremy Allison <jra-eUNUBHrolfbYtjvyW6yDsg@public.gmane.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.

WARNING: multiple messages have this Message-ID (diff)
From: Jeremy Allison <jra@samba.org>
To: David Howells <dhowells@redhat.com>
Cc: Jeremy Allison <jra@samba.org>, Steve French <smfrench@gmail.com>,
	viro@zeniv.linux.org.uk, jlayton@redhat.com, mcao@us.ibm.com,
	aneesh.kumar@linux.vnet.ibm.com, linux-cifs@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	samba-technical@lists.samba.org, sjayaraman@suse.de,
	linux-ext4@vger.kernel.org
Subject: Re: [PATCH] Ext4: Make file creation time, i_version and i_generation available by xattrs
Date: Tue, 29 Jun 2010 15:59:44 -0700	[thread overview]
Message-ID: <20100629225944.GA22924@samba1> (raw)
In-Reply-To: <26197.1277851477@redhat.com>

On Tue, Jun 29, 2010 at 11:44:37PM +0100, David Howells wrote:
> Jeremy Allison <jra@samba.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.

  parent reply	other threads:[~2010-06-29 22:59 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-06-28 16:26 [PATCH] Ext4: Make file creation time, i_version and i_generation available by xattrs David Howells
     [not found] ` <20100628162626.6026.26679.stgit-S6HVgzuS8uM4Awkfq6JHfwNdhmdF6hFW@public.gmane.org>
2010-06-28 16:33   ` Steve French
2010-06-28 16:33     ` Steve French
2010-06-28 16:48     ` Jeremy Allison
2010-06-28 17:04       ` Steve French
2010-06-28 17:04         ` Steve French
     [not found]         ` <AANLkTilkfPkvyuQvN9zKrrY3DhJZ5iUfa5RXfErFwTiA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-06-28 17:14           ` Jeremy Allison
2010-06-28 17:14             ` Jeremy Allison
2010-06-28 19:21         ` Christoph Hellwig
2010-06-29 22:44       ` David Howells
     [not found]         ` <26197.1277851477-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2010-06-29 22:59           ` Jeremy Allison [this message]
2010-06-29 22:59             ` Jeremy Allison
2010-06-29 23:31             ` David Howells
2010-06-28 19:08 ` Andreas Dilger
     [not found] ` <19AAF9AA-2445-4C73-808B-4AD9C5C7E769-m1MBpc4rdrD3fQ9qLvQP4Q@public.gmane.org>
2010-06-28 19:38   ` David Howells
2010-06-28 19:38     ` David Howells
2010-06-28 19:41     ` Steve French
2010-06-28 19:41       ` Steve French
     [not found]       ` <AANLkTikhZn15GmOTe-fsM2IgxHFxtZIRBOb_4kPWSR4E-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-06-29 18:13         ` Andreas Dilger
2010-06-29 18:13           ` Andreas Dilger

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