On Mon, 16 Feb 2015 15:17:51 -0500 bfields@xxxxxxxxxxxx (J. Bruce Fields) wrote: > On Mon, Feb 16, 2015 at 12:21:07PM +1100, NeilBrown wrote: > > > > > > - note that 'nohide' is irrelevant for NFSv4 > > - note that children on a 'crossmnt' filesystem cannot be unexported > > - note that 'nocrossmnt' is a valid option, but probably not useful. > > > > Signed-off-by: NeilBrown <neilb@xxxxxxx> > > > > --- > > > > I wonder if we should add a new option, e.g. "noaccess" so that children > > of a "crossmnt" filesystem can be hidden. The kernel wouldn't need to > > know about this. It would just tell mountd to refuse to export that > > filesystem even if the parent was "crossmnt". > > ?? > > Seems logical enough, but I can't recall seeing requests for it, and > the options here already seem complicated enough. I haven't seem requests myself. Just rumours of 'nohide' not working with NFSv4, which seems to suggest that someone wants something like that. But I cannot find a clear source. Maybe: http://ubuntuforums.org/showthread.php?t=2152643 http://ubuntuforums.org/showthread.php?t=1603881 > > In theory something like that could also be done with namespaces. (So, > run mountd in a separate mount namespace that lacks those children.) Do any of the NFS man pages need to be updated to say something about namespaces? NeilBrown
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