On 10/29/2009 11:17 AM, Steve Dickson wrote:
>
>
> On 10/28/2009 03:05 PM, Roland McGrath wrote:
>> It sounds like you are saying that there is no way to export the same
>> host filesystems with the same client-perceived names under v4 as was
>> being done before under v[23]. Is that really true?
> With Pre-F12 servers... Yeah...
>
> The V4 protocol requires a 'pseudo root' to be defined. Other servers simply
> make '/' the pseudo root which allows all exports just to work with all versions.
> The Linux server have the feature of being able to define the pseudo root with
> the use of the 'fsid=0' export option. A feature none of the other servers
> have.
Except that when the other servers create a pseudo root, they don't
*also* expose that pseudo root. I'm fairly strongly of the opinion that
our NFS server should do the same thing: don't expose the pseudo root as
an actual mount.
> Unfortunately, there was no forethought as to what happens when a
> pseudo root is not defined, until recently... Patches in both the
> F-12 kernel and rpc.mountd now dynamically allocate a pseudo root
> when one is not defined... Basically meaning '/' becomes the pseudo
> root when there is no fsid=0 export option.
And does this explicitly export the / filesystem? I would certainly
hope not as that could surprise the hell out of an admin when his /
filesystem is now exposed when it didn't use to be.
>>
>> My old /etc/exports is:
>>
>> /mirror *(ro,insecure,sync,mp,all_squash)
>>
>> So clients mount server:/mirror to see my /mirror directory's contents.
>> No other /foo directory is exported or visible at all to clients, and
>> that's how it should stay.
>>
>> How do I get the same results for v4 clients?
> Use a F-12 server or added the '/ *(ro,fsid=0)' export entry like:
>
> / *(ro,fsid=0)
> /mirror *(ro,insecure,sync,mp,all_squash)
I'm perfectly fine with adding the entry to the exports file, but I
think the fsid=0 export entry should be a non-functioning entry other
than setting the pseudo root. As you've described it so far, it also
happens to be a live export and I think that's wrong and should be fixed.
--
Doug Ledford <dledford@xxxxxxxxxx>
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http://people.redhat.com/dledford
Infiniband specific RPMs available at
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