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From: "Aneesh Kumar K. V" <aneesh.kumar@linux.vnet.ibm.com>
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Subject: Re: [RFC][PATCH 06/10] cifs: define inode-level cache object and register them
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Date: Sun, 27 Jun 2010 23:47:21 +0530
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Lines: 100
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Message-ID: <871vbscpce.fsf@linux.vnet.ibm.com>
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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>
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Mime-Version: 1.0
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Content-Type: text/plain; charset=utf-8
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Content-Transfer-Encoding: QUOTED-PRINTABLE
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Cc: David Howells <dhowells@redhat.com>,
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Jeff Layton <jlayton@redhat.com>,
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Jeff Layton <jlayton@samba.org>, linux-cifs@vger.kernel.org,
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linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
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samba-technical@lists.samba.org,
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Suresh Jayaraman <sjayaraman@suse.de>
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To: Mingming Cao <mcao@us.ibm.com>, Steve French <smfrench@gmail.com>,
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"DENIEL Philippe" <philippe.deniel@cea.fr>
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X-From: linux-kernel-owner@vger.kernel.org Sun Jun 27 20:18:00 2010
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Archived-At: <http://permalink.gmane.org/gmane.linux.kernel/1003357>
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On Fri, 25 Jun 2010 17:52:24 -0700, Mingming Cao <mcao@us.ibm.com> wrot=
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e:
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>=20
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>=20
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> Steve French <smfrench@gmail.com> wrote on 06/25/2010 04:05:30 PM:
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>=20
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> > Steve French <smfrench@gmail.com>
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> > 06/25/2010 04:05 PM
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> >
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> > To
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> >
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> > Jeff Layton <jlayton@samba.org>, "Aneesh Kumar K.V"
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> > <aneesh.kumar@linux.vnet.ibm.com>, Mingming Cao/Beaverton/IBM@IBMUS
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> >
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> > cc
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> >
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> > David Howells <dhowells@redhat.com>, Suresh Jayaraman
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> > <sjayaraman@suse.de>, linux-cifs@vger.kernel.org, linux-
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> > fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, samba-
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> > technical@lists.samba.org, Jeff Layton <jlayton@redhat.com>
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> >
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> > Subject
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> >
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> > Re: [RFC][PATCH 06/10] cifs: define inode-level cache object and
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> > register them
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> >
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> > On Fri, Jun 25, 2010 at 5:26 PM, Jeff Layton <jlayton@samba.org> wr=
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ote:
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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 =
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a
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> better
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> > > > > choice since it changes less frequently, but I don't guess th=
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at it
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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
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> > altered when data is
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> > > > written. =C2=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=
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that
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> > > affects ctime. According to the stat(2) manpage:
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> > >
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> > > =C2=A0 =C2=A0 =C2=A0 The field st_ctime is changed by writing or =
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by setting
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> > =C2=A0inode =C2=A0informa-
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> > > =C2=A0 =C2=A0 =C2=A0 tion (i.e., owner, group, link count, mode, =
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etc.).
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> > >
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> > > > Note that Ext4 appears to have a file creation time field in it=
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s
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> inode
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> > > > (struct ext4_inode::i_crtime[_extra]). =C2=A0Can Samba be made =
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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 han=
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dy to
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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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> >
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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).=C2=A0 An obstacle in the past ha=
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d been
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> > that samba server stores its own fake creation time in an ndr encod=
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ed
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> > xattr which complicates things.
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> >
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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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> >
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>=20
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> Not yet,
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> The ext4 file creation time only accesable from the kernel at the mo=
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ment.
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> There were discussion
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> to make this information avaliable via xattr before, but was rejected=
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,
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> since most people
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> agree that making this info avalibele via stat() is more standard. Ho=
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wever
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> modifying stat() would imply
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> big interface change. thus no action has been taken yet.
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NFS ganesha pNFS also had a requirement for getting i_generation and
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inode number in userspace. So may be we should now look at updating
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stat or add a variant syscall that include i_generation and create time
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in the return value
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-aneesh
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