Re: inconsistent mount attributes (ro/rw), RHEL5 / Netapp

["Paul Krizak" <paul.krizak@amd.com>]

 > We might then be able to add an '--unshared-cache' option (any
 > suggestions for a better name?) to mount in order to allow those people
 > who fully understand the consequences to override, and hence to mount
 > the same filesystem with different mount options, but no sharing of the
 > page cache with the original filesystem.

I can assure you that AMD systems engineering would *much* prefer having 
the VFS stack fixed such that we don't need to do something like this.

It would be much better to make the kernel understand that it *can* 
mount the same NFS filesystem twice, once read-only and again 
read-write, with the appropriate cache coherency, rather than force us 
to run in a potentially dangerous configuration that might lead to data 
corruption.

I agree with Ian that the VFS changes need to take priority.  The only 
change I see that needs to be made to mount is that it needs to spit out 
a warning (or fail completely) if the requested options cannot be satisfied.

Paul Krizak                         5900 E. Ben White Blvd. MS 625
Advanced Micro Devices              Austin, TX  78741
Linux/Unix Systems Engineering      Phone: (512) 602-8775
Silicon Design Division             Cell:  (512) 791-0686






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