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84 lines
3.7 KiB
Text
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: Fri, 25 Jun 2010 18:14:16 +0530
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Lines: 41
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Message-ID: <4C24A4A0.90408@suse.de>
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References: <1277220206-3559-1-git-send-email-sjayaraman@suse.de> <yes> <9720.1277312290@redhat.com>
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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 Fri Jun 25 14:44:28 2010
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Envelope-to: glkc-linux-cifs-1dZseelyfdZg9hUCZPvPmw@public.gmane.org
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Archived-At: <http://permalink.gmane.org/gmane.linux.kernel/1002945>
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On 06/23/2010 10:28 PM, David Howells wrote:
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> Suresh Jayaraman <sjayaraman-l3A5Bk7waGM@public.gmane.org> wrote:
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>
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>> Define superblock-level cache index objects (managed by cifsTconInfo
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>> structs). Each superblock object is created in a server-level index object
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>> and in itself an index into which inode-level objects are inserted.
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>>
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>> Currently, the superblock objects are keyed by sharename.
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>
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> Seems reasonable. Is there any way you can check that the share you are
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> looking at on a server is the same as the last time you looked? Can you
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Good point.
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I thought of using TID (Tree identifier; a unique ID for a resource in
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use by client) along with sharename. But, Server is free to reuse them
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when the tree connection closes and does not guarantee the same Tid for
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a particular resource across tree connections.
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Also, considering the UNC name of the resource (//server/share) may not
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be a good idea too as the cache will not be used when for e.g. IPaddress
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is used to mount.
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So, if a server does something like this:
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- export a share 'foo' (original server path: /export/vol1/foo)
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- client mounts and uses it
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- server unexports the share 'foo'
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- server exports 'foo' (original sever path: /export/vol2/foo)
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we have a bit of problem..
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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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Thanks,
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--
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Suresh Jayaraman
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