mirror of
https://git.notmuchmail.org/git/notmuch
synced 2024-11-30 22:54:11 +01:00
157 lines
6 KiB
Text
157 lines
6 KiB
Text
|
From: "Aneesh Kumar K. V" <aneesh.kumar@linux.vnet.ibm.com>
|
||
|
|
Subject: Re: [RFC][PATCH 06/10] cifs: define inode-level cache object and register them
|
||
|
|
Date: Sun, 27 Jun 2010 23:47:21 +0530
|
||
|
|
Lines: 100
|
||
|
|
Message-ID: <871vbscpce.fsf@linux.vnet.ibm.com>
|
||
|
|
References: <20100625125306.7f9b1966@tlielax.poochiereds.net> <4C24A606.5040001@suse.de> <1277220214-3597-1-git-send-email-sjayaraman@suse.de> <9822.1277312573@redhat.com> <22697.1277470549@redhat.com> <18628.1277502398@redhat.com> <20100625182651.36800d06@tlielax.poochiereds.net> <AANLkTilOTrHLvLv4XWYZO6xCnYZgYT7gO2M-oKZ6VvqM@mail.gmail.com> <OFB55E8EC7.E8DD23D5-ON8725774E.0004921E-8825774E.0004CC31@us.ibm.com>
|
||
|
|
Mime-Version: 1.0
|
||
|
|
Content-Type: text/plain; charset=utf-8
|
||
|
|
Content-Transfer-Encoding: QUOTED-PRINTABLE
|
||
|
|
Cc: David Howells <dhowells@redhat.com>,
|
||
|
|
Jeff Layton <jlayton@redhat.com>,
|
||
|
|
Jeff Layton <jlayton@samba.org>, linux-cifs@vger.kernel.org,
|
||
|
|
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
|
||
|
|
samba-technical@lists.samba.org,
|
||
|
|
Suresh Jayaraman <sjayaraman@suse.de>
|
||
|
|
To: Mingming Cao <mcao@us.ibm.com>, Steve French <smfrench@gmail.com>,
|
||
|
|
"DENIEL Philippe" <philippe.deniel@cea.fr>
|
||
|
|
X-From: linux-kernel-owner@vger.kernel.org Sun Jun 27 20:18:00 2010
|
||
|
|
Return-path: <linux-kernel-owner@vger.kernel.org>
|
||
|
|
Envelope-to: glk-linux-kernel-3@lo.gmane.org
|
||
|
|
Received: from vger.kernel.org ([209.132.180.67])
|
||
|
|
by lo.gmane.org with esmtp (Exim 4.69)
|
||
|
|
(envelope-from <linux-kernel-owner@vger.kernel.org>)
|
||
|
|
id 1OSwQZ-0003Kh-Vu
|
||
|
|
for glk-linux-kernel-3@lo.gmane.org; Sun, 27 Jun 2010 20:18:00 +0200
|
||
|
|
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
|
||
|
|
id S1754631Ab0F0SRq convert rfc822-to-quoted-printable (ORCPT
|
||
|
|
<rfc822;glk-linux-kernel-3@m.gmane.org>);
|
||
|
|
Sun, 27 Jun 2010 14:17:46 -0400
|
||
|
|
Received: from e23smtp07.au.ibm.com ([202.81.31.140]:52430 "EHLO
|
||
|
|
e23smtp07.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
|
||
|
|
with ESMTP id S1753837Ab0F0SRl convert rfc822-to-8bit (ORCPT
|
||
|
|
<rfc822;linux-kernel@vger.kernel.org>);
|
||
|
|
Sun, 27 Jun 2010 14:17:41 -0400
|
||
|
|
Received: from d23relay05.au.ibm.com (d23relay05.au.ibm.com [202.81.31.247])
|
||
|
|
by e23smtp07.au.ibm.com (8.14.4/8.13.1) with ESMTP id o5RIHbfJ012483;
|
||
|
|
Mon, 28 Jun 2010 04:17:37 +1000
|
||
|
|
Received: from d23av03.au.ibm.com (d23av03.au.ibm.com [9.190.234.97])
|
||
|
|
by d23relay05.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id o5RIHW9f1130634;
|
||
|
|
Mon, 28 Jun 2010 04:17:32 +1000
|
||
|
|
Received: from d23av03.au.ibm.com (loopback [127.0.0.1])
|
||
|
|
by d23av03.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id o5RIHVcR027534;
|
||
|
|
Mon, 28 Jun 2010 04:17:32 +1000
|
||
|
|
Received: from skywalker.linux.vnet.ibm.com ([9.77.196.78])
|
||
|
|
by d23av03.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id o5RIHMFl027485;
|
||
|
|
Mon, 28 Jun 2010 04:17:24 +1000
|
||
|
|
In-Reply-To: <OFB55E8EC7.E8DD23D5-ON8725774E.0004921E-8825774E.0004CC31@us.ibm.com>
|
||
|
|
User-Agent: Notmuch/ (http://notmuchmail.org) Emacs/24.0.50.1 (i686-pc-linux-gnu)
|
||
|
|
Sender: linux-kernel-owner@vger.kernel.org
|
||
|
|
Precedence: bulk
|
||
|
|
List-ID: <linux-kernel.vger.kernel.org>
|
||
|
|
X-Mailing-List: linux-kernel@vger.kernel.org
|
||
|
|
Archived-At: <http://permalink.gmane.org/gmane.linux.kernel/1003357>
|
||
|
|
|
||
|
|
On Fri, 25 Jun 2010 17:52:24 -0700, Mingming Cao <mcao@us.ibm.com> wrot=
|
||
|
|
e:
|
||
|
|
>=20
|
||
|
|
>=20
|
||
|
|
> Steve French <smfrench@gmail.com> wrote on 06/25/2010 04:05:30 PM:
|
||
|
|
>=20
|
||
|
|
> > Steve French <smfrench@gmail.com>
|
||
|
|
> > 06/25/2010 04:05 PM
|
||
|
|
> >
|
||
|
|
> > To
|
||
|
|
> >
|
||
|
|
> > Jeff Layton <jlayton@samba.org>, "Aneesh Kumar K.V"
|
||
|
|
> > <aneesh.kumar@linux.vnet.ibm.com>, Mingming Cao/Beaverton/IBM@IBMUS
|
||
|
|
> >
|
||
|
|
> > cc
|
||
|
|
> >
|
||
|
|
> > David Howells <dhowells@redhat.com>, Suresh Jayaraman
|
||
|
|
> > <sjayaraman@suse.de>, linux-cifs@vger.kernel.org, linux-
|
||
|
|
> > fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, samba-
|
||
|
|
> > technical@lists.samba.org, Jeff Layton <jlayton@redhat.com>
|
||
|
|
> >
|
||
|
|
> > Subject
|
||
|
|
> >
|
||
|
|
> > Re: [RFC][PATCH 06/10] cifs: define inode-level cache object and
|
||
|
|
> > register them
|
||
|
|
> >
|
||
|
|
> > On Fri, Jun 25, 2010 at 5:26 PM, Jeff Layton <jlayton@samba.org> wr=
|
||
|
|
ote:
|
||
|
|
> > >
|
||
|
|
> > > On Fri, 25 Jun 2010 22:46:38 +0100
|
||
|
|
> > > David Howells <dhowells@redhat.com> wrote:
|
||
|
|
> > >
|
||
|
|
> > > > Jeff Layton <jlayton@samba.org> wrote:
|
||
|
|
> > > >
|
||
|
|
> > > > > Looks like it mostly uses the ctime. IMO, the mtime would be =
|
||
|
|
a
|
||
|
|
> better
|
||
|
|
> > > > > choice since it changes less frequently, but I don't guess th=
|
||
|
|
at it
|
||
|
|
> > > > > matters very much.
|
||
|
|
> > > >
|
||
|
|
> > > > I'd've thought mtime changes more frequently since that's
|
||
|
|
> > altered when data is
|
||
|
|
> > > > written. =C2=A0ctime is changed when attributes are changed.
|
||
|
|
> > > >
|
||
|
|
> > >
|
||
|
|
> > > IIUC, updating mtime for a write is also an attribute change, and=
|
||
|
|
that
|
||
|
|
> > > affects ctime. According to the stat(2) manpage:
|
||
|
|
> > >
|
||
|
|
> > > =C2=A0 =C2=A0 =C2=A0 The field st_ctime is changed by writing or =
|
||
|
|
by setting
|
||
|
|
> > =C2=A0inode =C2=A0informa-
|
||
|
|
> > > =C2=A0 =C2=A0 =C2=A0 tion (i.e., owner, group, link count, mode, =
|
||
|
|
etc.).
|
||
|
|
> > >
|
||
|
|
> > > > Note that Ext4 appears to have a file creation time field in it=
|
||
|
|
s
|
||
|
|
> inode
|
||
|
|
> > > > (struct ext4_inode::i_crtime[_extra]). =C2=A0Can Samba be made =
|
||
|
|
to use
|
||
|
|
> that?
|
||
|
|
> > > >
|
||
|
|
> > >
|
||
|
|
> > > Is it exposed to userspace in any (standard) way? It would be han=
|
||
|
|
dy to
|
||
|
|
> > > have that. While we're wishing...it might also be nice to have a
|
||
|
|
> > > standard way to get at the i_generation from userspace too.
|
||
|
|
> > >
|
||
|
|
> >
|
||
|
|
> > Yes - I have talked with MingMing and Aneesh about those (NFS may
|
||
|
|
> > someday be able to use those too).=C2=A0 An obstacle in the past ha=
|
||
|
|
d been
|
||
|
|
> > that samba server stores its own fake creation time in an ndr encod=
|
||
|
|
ed
|
||
|
|
> > xattr which complicates things.
|
||
|
|
> >
|
||
|
|
> > MingMing/Annesh -
|
||
|
|
> > Xattr or other way to get at birth time?
|
||
|
|
> >
|
||
|
|
> >
|
||
|
|
>=20
|
||
|
|
> Not yet,
|
||
|
|
> The ext4 file creation time only accesable from the kernel at the mo=
|
||
|
|
ment.
|
||
|
|
> There were discussion
|
||
|
|
> to make this information avaliable via xattr before, but was rejected=
|
||
|
|
,
|
||
|
|
> since most people
|
||
|
|
> agree that making this info avalibele via stat() is more standard. Ho=
|
||
|
|
wever
|
||
|
|
> modifying stat() would imply
|
||
|
|
> big interface change. thus no action has been taken yet.
|
||
|
|
|
||
|
|
NFS ganesha pNFS also had a requirement for getting i_generation and
|
||
|
|
inode number in userspace. So may be we should now look at updating
|
||
|
|
stat or add a variant syscall that include i_generation and create time
|
||
|
|
in the return value
|
||
|
|
|
||
|
|
-aneesh
|
||
|
|
|
||
|
|
|