notmuch/test/corpora/lkml/cur/1382298587.003112:2,
David Bremner 126347b694 Import notmuch_0.38.2.orig.tar.xz
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From: Jeff Layton <jlayton@samba.org>
Subject: Re: [RFC][PATCH 06/10] cifs: define inode-level cache object and
register them
Date: Fri, 25 Jun 2010 18:26:51 -0400
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Cc: linux-cifs@vger.kernel.org, samba-technical@lists.samba.org,
linux-kernel@vger.kernel.org, Steve French <smfrench@gmail.com>,
linux-fsdevel@vger.kernel.org
To: David Howells <dhowells@redhat.com>
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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. ctime 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:
The field st_ctime is changed by writing or by setting inode informa-
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]). Can Samba be made to use 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.
--
Jeff Layton <jlayton@samba.org>