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   1 From: Jeff Layton <jlayton@samba.org>
   2 Subject: Re: [RFC][PATCH 06/10] cifs: define inode-level cache object and
   3         register them
   4 Date: Fri, 25 Jun 2010 18:26:51 -0400
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   8         <4C24A606.5040001@suse.de>
   9         <1277220214-3597-1-git-send-email-sjayaraman@suse.de> <yes>
  10         <9822.1277312573@redhat.com> <22697.1277470549@redhat.com>
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  15 Cc: linux-cifs@vger.kernel.org, samba-technical@lists.samba.org,
  16         linux-kernel@vger.kernel.org, Steve French <smfrench@gmail.com>,
  17         linux-fsdevel@vger.kernel.org
  18 To: David Howells <dhowells@redhat.com>
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  73
  74 On Fri, 25 Jun 2010 22:46:38 +0100
  75 David Howells <dhowells@redhat.com> wrote:
  76
  77 > Jeff Layton <jlayton@samba.org> wrote:
  78 >
  79 > > Looks like it mostly uses the ctime. IMO, the mtime would be a better
  80 > > choice since it changes less frequently, but I don't guess that it
  81 > > matters very much.
  82 >
  83 > I'd've thought mtime changes more frequently since that's altered when data is
  84 > written.  ctime is changed when attributes are changed.
  85 >
  86
  87 IIUC, updating mtime for a write is also an attribute change, and that
  88 affects ctime. According to the stat(2) manpage:
  89
  90        The field st_ctime is changed by writing or by setting  inode  informa-
  91        tion (i.e., owner, group, link count, mode, etc.).
  92
  93 > Note that Ext4 appears to have a file creation time field in its inode
  94 > (struct ext4_inode::i_crtime[_extra]).  Can Samba be made to use that?
  95 >
  96
  97 Is it exposed to userspace in any (standard) way? It would be handy to
  98 have that. While we're wishing...it might also be nice to have a
  99 standard way to get at the i_generation from userspace too.
 100
 101 --
 102 Jeff Layton <jlayton@samba.org>
 103
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