Re: [PATCH 04/09] cifs: define superblock-level cache index objects and register them

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On 07/20/2010 07:07 PM, Jeff Layton wrote:
> On Tue, 20 Jul 2010 08:53:27 -0400
> Jeff Layton <jlayton@xxxxxxxxx> wrote:
> 
>> On Mon,  5 Jul 2010 18:12:27 +0530
>> Suresh Jayaraman <sjayaraman@xxxxxxx> wrote:
>>
>>> Define superblock-level cache index objects (managed by cifsTconInfo structs).
>>> Each superblock object is created in a server-level index object and in itself
>>> an index into which inode-level objects are inserted.
>>>
>>> The superblock object is keyed by sharename. The UniqueId/IndexNumber is used to
>>> validate that the exported share is the same since we accessed it last time.
>>>
>>> Signed-off-by: Suresh Jayaraman <sjayaraman@xxxxxxx>
>>
>> Hmm...Steve started merging these already but I've just now had the
>> chance to review them.
>>
>> This approach may be a problem. It seems to make the assumption that
>> there is only a single tcon per superblock. How exactly will this work
>> when there are multiple tcons per superblock as will be the case with
>> multisession mounts?
>>
>> By having a cache cookie per tcon, will that mean that you'll
>> potentially have multiple versions of cached inodes (one for each tcon)?
>>

In case of multisession mounts, there is a cache cookie per tcon, but
they will point to the same cached inodes.

> Ahh nm. This shouldn't be a problem since this key is based on the
> sharename only and that will be the same between the multiple tcons.

yeah. I think the description could be a bit more clear..


Thanks,

-- 
Suresh Jayaraman
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