export operations rewrite

This patchset is a medium scale rewrite of the export operations interface. The goal is to make the interface less complex, and easier to understand from the filesystem side, aswell as preparing generic support for exporting of 64bit inode numbers.

This touches all nfs exporting filesystems, and I've done testing on all of the filesystems I have here locally (xfs, ext2, ext3, reiserfs, jfs)

Compared to the last version I've fixed the white space issues that checkpatch.pl complained about.

Note that this patch series is against mainline. There will be some xfs changes landing in -mm soon that revamp lots of the code touched here. They should hopefully include the first path in the series so it can be simply dropped, but the xfs conversion will need some smaller updates. I will send this update as soon as the xfs tree updates get pulled into -mm.

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