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106 lines
4.6 KiB
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106 lines
4.6 KiB
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From: Jeff Layton <jlayton@samba.org>
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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 18:26:51 -0400
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Lines: 30
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Message-ID: <20100625182651.36800d06@tlielax.poochiereds.net>
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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> <yes>
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<9822.1277312573@redhat.com> <22697.1277470549@redhat.com>
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<18628.1277502398@redhat.com>
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Cc: linux-cifs@vger.kernel.org, samba-technical@lists.samba.org,
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linux-kernel@vger.kernel.org, Steve French <smfrench@gmail.com>,
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linux-fsdevel@vger.kernel.org
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To: David Howells <dhowells@redhat.com>
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Archived-At: <http://permalink.gmane.org/gmane.linux.kernel/1003148>
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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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> 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 better
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> > choice since it changes less frequently, but I don't guess that 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 altered when data is
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> written. ctime is changed when attributes are changed.
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>
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IIUC, updating mtime for a write is also an attribute change, and that
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affects ctime. According to the stat(2) manpage:
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The field st_ctime is changed by writing or by setting inode informa-
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tion (i.e., owner, group, link count, mode, etc.).
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> Note that Ext4 appears to have a file creation time field in its inode
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> (struct ext4_inode::i_crtime[_extra]). Can Samba be made to use that?
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>
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Is it exposed to userspace in any (standard) way? It would be handy 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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Jeff Layton <jlayton@samba.org>
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