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From: David Howells <dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
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Subject: Re: [RFC][PATCH 05/10] cifs: define superblock-level cache index objects and register them
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Date: Fri, 25 Jun 2010 14:26:52 +0100
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Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley
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Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United
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Kingdom.
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Registered in England and Wales under Company Registration No. 3798903
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Lines: 35
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Message-ID: <23204.1277472412@redhat.com>
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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>
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Cc: dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, Suresh Jayaraman <sjayaraman-l3A5Bk7waGM@public.gmane.org>,
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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: unlisted-recipients:; (no To-header on input)
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X-From: linux-cifs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Fri Jun 25 15:27:01 2010
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id 1OS8vt-0000Xv-FL
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for glkc-linux-cifs-1dZseelyfdZg9hUCZPvPmw@public.gmane.org; Fri, 25 Jun 2010 15:27:01 +0200
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In-Reply-To: <22746.1277470713-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
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Archived-At: <http://permalink.gmane.org/gmane.linux.kernel/1002964>
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David Howells <dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
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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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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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(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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(2) FILE_UNIX_BASIC_INFO: DevMajor, DevMinor, UniqueId.
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(3) FILE_INFO_STANDARD: CreationDate, CreationTime.
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(4) FILE_INFO_BASIC: CreationTime.
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(5) FILE_DIRECTORY_INFO: FileIndex, CreationTime, FileName.
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(6) SEARCH_ID_FULL_DIR_INFO: FileIndex, CreationTime, UniqueId, FileName.
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(7) FILE_BOTH_DIRECTORY_INFO: FileIndex, CreationTime, ShortName, FileName.
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(8) OPEN_RSP_EXT: Fid, CreationTime, VolumeGUID, FileId.
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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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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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David
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