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90 lines
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From: Suresh Jayaraman <sjayaraman-l3A5Bk7waGM@public.gmane.org>
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Subject: Re: [RFC][PATCH 05/10] cifs: define superblock-level cache index
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objects and register them
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Date: Mon, 28 Jun 2010 18:23:13 +0530
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Lines: 48
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Message-ID: <4C289B39.4060901@suse.de>
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References: <22746.1277470713@redhat.com> <4C24A4A0.90408@suse.de> <1277220206-3559-1-git-send-email-sjayaraman@suse.de> <yes> <9720.1277312290@redhat.com> <23204.1277472412@redhat.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: 7bit
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Cc: Steve French <smfrench-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, linux-cifs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
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linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
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To: David Howells <dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
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X-From: linux-cifs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Mon Jun 28 14:53:24 2010
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Return-path: <linux-cifs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
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Envelope-to: glkc-linux-cifs-1dZseelyfdZg9hUCZPvPmw@public.gmane.org
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Received: from vger.kernel.org ([209.132.180.67])
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by lo.gmane.org with esmtp (Exim 4.69)
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(envelope-from <linux-cifs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>)
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id 1OTDq0-00054Q-At
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for glkc-linux-cifs-1dZseelyfdZg9hUCZPvPmw@public.gmane.org; Mon, 28 Jun 2010 14:53:24 +0200
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Received: (majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org) by vger.kernel.org via listexpand
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id S1754503Ab0F1MxX (ORCPT <rfc822;glkc-linux-cifs@m.gmane.org>);
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Mon, 28 Jun 2010 08:53:23 -0400
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Received: from cantor2.suse.de ([195.135.220.15]:48374 "EHLO mx2.suse.de"
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rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
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id S1754456Ab0F1MxW (ORCPT <rfc822;linux-cifs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>);
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Mon, 28 Jun 2010 08:53:22 -0400
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Received: from relay2.suse.de (charybdis-ext.suse.de [195.135.221.2])
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by mx2.suse.de (Postfix) with ESMTP id 7BDC18672B;
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Mon, 28 Jun 2010 14:53:21 +0200 (CEST)
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User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.5) Gecko/20091130 SUSE/3.0.0-1.1.1 Thunderbird/3.0
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In-Reply-To: <23204.1277472412-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
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Sender: linux-cifs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
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Precedence: bulk
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List-ID: <linux-cifs.vger.kernel.org>
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X-Mailing-List: linux-cifs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
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Archived-At: <http://permalink.gmane.org/gmane.linux.kernel/1003530>
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On 06/25/2010 06:56 PM, David Howells wrote:
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> David Howells <dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
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>
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>>>> validate the root directory of the share in some way?
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>>>
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>>> I don't know if there is a way to do this.
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>>
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>> Is there an inode number or something? Even the creation time might do.
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>
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> Looking in cifspdu.h, there are a number of things that it might be possible
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> to use.
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>
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> (1) FILE_ALL_INFO: CreationTime, IndexNumber, IndexNumber1, FileName
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> (assuming this isn't flattened to '\' or something for the root of a
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> share.
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>
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> (2) FILE_UNIX_BASIC_INFO: DevMajor, DevMinor, UniqueId.
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>
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> (3) FILE_INFO_STANDARD: CreationDate, CreationTime.
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>
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> (4) FILE_INFO_BASIC: CreationTime.
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>
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> (5) FILE_DIRECTORY_INFO: FileIndex, CreationTime, FileName.
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>
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> (6) SEARCH_ID_FULL_DIR_INFO: FileIndex, CreationTime, UniqueId, FileName.
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>
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> (7) FILE_BOTH_DIRECTORY_INFO: FileIndex, CreationTime, ShortName, FileName.
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>
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> (8) OPEN_RSP_EXT: Fid, CreationTime, VolumeGUID, FileId.
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>
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> You may have to choose different sets of things, depending on what the server
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> has on offer. Also, don't forget, if you can't work out whether a share is
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Did you mean we need to validate differently for different servers?
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I just did some testing and it looks like we could rely on CreationTime,
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IndexNumber for validating with Windows servers (FileName is relative to
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the mapped drive) and UniqueId for validating with Samba servers. I did
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not test all possibilities (there could be more).
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> coherent or not from the above, you can always use LastWriteTime, ChangeTime
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> and EndOfFile and just discard the whole subtree if they differ.
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>
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Thanks,
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--
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Suresh Jayaraman
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