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123 lines
4.8 KiB
Text
123 lines
4.8 KiB
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From: Steve French <smfrench@gmail.com>
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Subject: Re: [RFC][PATCH 06/10] cifs: define inode-level cache object and
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register them
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Date: Fri, 25 Jun 2010 18:05:30 -0500
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Lines: 51
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Message-ID: <AANLkTilOTrHLvLv4XWYZO6xCnYZgYT7gO2M-oKZ6VvqM@mail.gmail.com>
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References: <20100625125306.7f9b1966@tlielax.poochiereds.net>
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<4C24A606.5040001@suse.de>
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<1277220214-3597-1-git-send-email-sjayaraman@suse.de>
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<9822.1277312573@redhat.com>
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<22697.1277470549@redhat.com>
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<18628.1277502398@redhat.com>
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<20100625182651.36800d06@tlielax.poochiereds.net>
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Mime-Version: 1.0
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Content-Type: text/plain; charset=ISO-8859-1
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Content-Transfer-Encoding: QUOTED-PRINTABLE
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Cc: David Howells <dhowells@redhat.com>,
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Suresh Jayaraman <sjayaraman@suse.de>,
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linux-cifs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
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linux-kernel@vger.kernel.org, samba-technical@lists.samba.org,
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Jeff Layton <jlayton@redhat.com>
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To: Jeff Layton <jlayton@samba.org>,
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"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
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Mingming Cao <mcao@us.ibm.com>
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X-From: linux-kernel-owner@vger.kernel.org Sat Jun 26 01:05:41 2010
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Return-path: <linux-kernel-owner@vger.kernel.org>
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Envelope-to: glk-linux-kernel-3@lo.gmane.org
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Received: from vger.kernel.org ([209.132.180.67])
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by lo.gmane.org with esmtp (Exim 4.69)
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(envelope-from <linux-kernel-owner@vger.kernel.org>)
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id 1OSHxs-0006a8-BA
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for glk-linux-kernel-3@lo.gmane.org; Sat, 26 Jun 2010 01:05:40 +0200
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In-Reply-To: <20100625182651.36800d06@tlielax.poochiereds.net>
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Sender: linux-kernel-owner@vger.kernel.org
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Precedence: bulk
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List-ID: <linux-kernel.vger.kernel.org>
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X-Mailing-List: linux-kernel@vger.kernel.org
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Archived-At: <http://permalink.gmane.org/gmane.linux.kernel/1003154>
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On Fri, Jun 25, 2010 at 5:26 PM, Jeff Layton <jlayton@samba.org> wrote:
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>
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> On Fri, 25 Jun 2010 22:46:38 +0100
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> David Howells <dhowells@redhat.com> wrote:
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>
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> > Jeff Layton <jlayton@samba.org> wrote:
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> >
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> > > Looks like it mostly uses the ctime. IMO, the mtime would be a be=
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tter
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> > > choice since it changes less frequently, but I don't guess that i=
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t
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> > > matters very much.
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> >
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> > I'd've thought mtime changes more frequently since that's altered w=
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hen data is
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> > written. =A0ctime is changed when attributes are changed.
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> >
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>
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> IIUC, updating mtime for a write is also an attribute change, and tha=
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t
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> affects ctime. According to the stat(2) manpage:
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>
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> =A0 =A0 =A0 The field st_ctime is changed by writing or by setting =A0=
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inode =A0informa-
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> =A0 =A0 =A0 tion (i.e., owner, group, link count, mode, etc.).
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>
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> > Note that Ext4 appears to have a file creation time field in its in=
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ode
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> > (struct ext4_inode::i_crtime[_extra]). =A0Can Samba be made to use =
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that?
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> >
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>
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> Is it exposed to userspace in any (standard) way? It would be handy t=
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o
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> have that. While we're wishing...it might also be nice to have a
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> standard way to get at the i_generation from userspace too.
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>
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Yes - I have talked with MingMing and Aneesh about those (NFS may
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someday be able to use those too).=A0 An obstacle in the past had been
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that samba server stores its own fake creation time in an ndr encoded
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xattr which complicates things.
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MingMing/Annesh -
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Xattr or other way to get at birth time?
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--
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Thanks,
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Steve
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