Re: [PATCH RFC v0 05/49] pnfsd: introduce pnfsd header files

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On Sun, Sep 29, 2013 at 05:21:30AM -0700, Christoph Hellwig wrote:
> > Bruce - are you ok with moving the pnfs interface definitions to
> > include/linux/exportfs.h along with struct export_operations?
> > 
> > In fact we can actually extend struct export_operations rather
> > than adding pnfs_export_operations...
> 
> Yes, it probably should go into the export ops, although the actual
> method signatures might need to be made a litle less nfs-specific for
> that.

I jsut took a brief look over the diff for the whole series in the git
tree and the old tree that still had block and exofs servers and have
revised my opinion a little bit:


 - the should be a layout_type field in struct export_operations,
   indicating that a filesystem support some sort of pnfs-like export.
 - there should be a struct pnfs_operations, but it should be confined
   to fs/nfsd: each layout can be a separate loadable module and gets
   registered there.  For the initial file layout that module is
   self-contained, but for e.g. block or objects it would have
   call into the filesystem through export_ops, although way lower level
   than the NFS XDR level, e.g. for block there would be one of to get
   the extent map, and one to allocate an extent.

This way we alsod avoid the dependcy on nfsd in the filesystems that the
cureent version introduces.
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