--- /dev/null
+From: Mingming Cao <mcao@us.ibm.com>
+Subject: Re: [RFC][PATCH 06/10] cifs: define inode-level cache object and
+ register them
+Date: Fri, 25 Jun 2010 17:52:24 -0700
+Lines: 92
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+Cc: linux-cifs@vger.kernel.org, Jeff Layton <jlayton@redhat.com>,
+ samba-technical@lists.samba.org, linux-kernel@vger.kernel.org,
+ David Howells <dhowells@redhat.com>, linux-fsdevel@vger.kernel.org,
+ "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
+To: Steve French <smfrench@gmail.com>
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+
+
+Steve French <smfrench@gmail.com> wrote on 06/25/2010 04:05:30 PM:
+
+> 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> wrot=
+e:
+> >
+> > 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 that=
+ it
+> > > > matters very much.
+> > >
+> > > I'd've thought mtime changes more frequently since that's
+> altered when data is
+> > > written. =A0ctime is changed when attributes are changed.
+> > >
+> >
+> > IIUC, updating mtime for a write is also an attribute change, and t=
+hat
+> > affects ctime. According to the stat(2) manpage:
+> >
+> > =A0 =A0 =A0 The field st_ctime is changed by writing or by setting
+> =A0inode =A0informa-
+> > =A0 =A0 =A0 tion (i.e., owner, group, link count, mode, etc.).
+> >
+> > > Note that Ext4 appears to have a file creation time field in its
+inode
+> > > (struct ext4_inode::i_crtime[_extra]). =A0Can Samba be made to us=
+e
+that?
+> > >
+> >
+> > Is it exposed to userspace in any (standard) way? It would be handy=
+ 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).=A0 An obstacle in the past had bee=
+n
+> that samba server stores its own fake creation time in an ndr encoded=
+
+> xattr which complicates things.
+>
+> MingMing/Annesh -
+> Xattr or other way to get at birth time?
+>
+>
+
+Not yet,
+ The ext4 file creation time only accesable from the kernel at the mome=
+nt.
+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. Howe=
+ver
+modifying stat() would imply
+big interface change. thus no action has been taken yet.
+
+> --
+> Thanks,
+>
+> Steve=
+
+
+
projects / notmuch / blobdiff