nfs: use change attribute for NFS re-exports
When exporting NFS, we may as well use the real change attribute returned by the original server instead of faking up a change attribute from the ctime. Note we can't do that by setting I_VERSION--that would also turn on the logic in iversion.h which treats the lower bit specially, and that doesn't make sense for NFS. So instead we define a new export operation for filesystems like NFS that want to manage the change attribute themselves. Signed-off-by:J. Bruce Fields <bfields@redhat.com> Reviewed-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
Chuck Lever <chuck.lever@oracle.com>
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02591f9f
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