Re: NFS mounts being mounted read-only depending upon mount order???

[Michael Walker <Michael.Walker@Cassatt.COM>]

Trond Myklebust wrote:
> On Mon, 2006-11-20 at 13:22 -0800, Michael Walker wrote:
> 
> There _are_ workarounds available. You can use the 'fsid' export option
> to tell knfsd to export the directories as if they were different
> filesystems.
> 
> For instance if I have
> 
>         /export/home	 141.211.133.0/24(rw,sync,no_subtree_check,fsid=0)
>         /export/home/trondmy 141.211.133.0/24(rw,sync,no_subtree_check,fsid=3)
> 
> in /etc/exports on the server, then I can do
> 
> mount -t nfs -oro server:/export/home /mnt/foo
> mount -t nfs -orw server:/export/home/trondmy /mnt/bar
> 
> with no trouble. From 'cat /proc/mounts'
> 
> server:/export/home /mnt/foo nfs rw,vers=3,rsize=32768,wsize=32768,hard,proto=tcp,timeo=600,retrans=2,sec=sys,addr=server 0 0
> server:/export/home/trondmy /mnt/bar nfs ro,vers=3,rsize=32768,wsize=32768,hard,proto=tcp,timeo=600,retrans=2,sec=sys,addr=server 0 0
> 
> as expected.

Oh - promising.

So - would I need to make the fsid unique for each mount - or could I just divide
them into two pools.  'fsid=1' for all 'read-only' exported filesystems
and 'fsid=2' for all read-write exported filesystems?

We could possibly make something like this work.

I could possibly generate unique fsid's for each export - but if the
above simple logic would be sufficient - that would be easiest.


> 
>> Can you point me to where the required 'mount --bind' fixes are
>> being discussed?  I haven't been able to find the
>> thread in the 'lkml' (not that it isn't there somewhere).
>>
>> Without the matching 'mount --bind' fixes this is a very serious
>> regression for us?
> 
> I believe the most recent patchsets can be found from
> 
> http://marc.theaimsgroup.com/?l=linux-kernel&m=115447687730218&w=2
> 

Thanx for the pointer - I'll track this thread down....


_Mike_


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