Re: bug with multiple mounts of filesystems in 2.6

[Mike Waychison]

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Trond Myklebust wrote:
> På må , 26/07/2004 klokka 17:33, skreiv Mike Waychison:
>
>
>>How is this any different than having two seperate nfs clients accessing
>>the same nfs export?
>
>
> It isn't, but why do you think that should be a reason for allowing it?
>
> By all means feel free to add "mount --bind -oro" capabilities, but it
> is neither useful nor is it necessary to break the NFS caching model in
> order to do so.
>

Agreed.  The two problems are orthogonal. [1]

As an example where sharing the super_block is wrong (albeit probably
just an oversight) is that the protocols (udp vs tcp) are not compared
in nfs_compare_super.  You could argue that the client fhandles should
be different though, I'm not sure..

Another 'bind mount extension' that would be nice to change at the
vfsmount level may be w/rsize, but that is probably a very intrusive
change for nfs and probably not possible.  Thoughts?

[1] - I haven't tested mounting nfs ro, and then mounting nfs rw using
the bind extensions.  Does nfs make any assumptions about the mount
being ro?

- --
Mike Waychison
Sun Microsystems, Inc.
1 (650) 352-5299 voice
1 (416) 202-8336 voice
http://www.sun.com

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