Messages in this thread | | | Date | Mon, 26 Jul 2004 20:56:56 -0400 | From | Mike Waychison <> | Subject | Re: bug with multiple mounts of filesystems in 2.6 |
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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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