linux-kernel - 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
From:	David Howells <dhowells@...hat.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	dhowells@...hat.com, Suresh Jayaraman <sjayaraman@...e.de>,
	Steve French <smfrench@...il.com>, linux-cifs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 05/10] cifs: define superblock-level cache index objects and register them

David Howells <dhowells@...hat.com> wrote:

> > > validate the root directory of the share in some way?
> >
> > I don't know if there is a way to do this.
> 
> Is there an inode number or something?  Even the creation time might do.

Looking in cifspdu.h, there are a number of things that it might be possible
to use.

 (1) FILE_ALL_INFO: CreationTime, IndexNumber, IndexNumber1, FileName
     (assuming this isn't flattened to '\' or something for the root of a
     share.

 (2) FILE_UNIX_BASIC_INFO: DevMajor, DevMinor, UniqueId.

 (3) FILE_INFO_STANDARD: CreationDate, CreationTime.

 (4) FILE_INFO_BASIC: CreationTime.

 (5) FILE_DIRECTORY_INFO: FileIndex, CreationTime, FileName.

 (6) SEARCH_ID_FULL_DIR_INFO: FileIndex, CreationTime, UniqueId, FileName.

 (7) FILE_BOTH_DIRECTORY_INFO: FileIndex, CreationTime, ShortName, FileName.

 (8) OPEN_RSP_EXT: Fid, CreationTime, VolumeGUID, FileId.

You may have to choose different sets of things, depending on what the server
has on offer.  Also, don't forget, if you can't work out whether a share is
coherent or not from the above, you can always use LastWriteTime, ChangeTime
and EndOfFile and just discard the whole subtree if they differ.

David
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