Re: [NFS] export dir thru 2 diff path names

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One last question for the maintainers and the community.  Is this viewed
as an undocumented feature or a bug to be fixed?  I would hate to
recommend use of the exported link, only to have it disabled by an
updated patch.

Wayne 

> -----Original Message-----
> From: J. Bruce Fields [mailto:bfields@xxxxxxxxxxxx] 
> Sent: Monday, November 10, 2008 2:45 PM
> To: Chuck Lever
> Cc: Murata, Dennis; nfs@xxxxxxxxxxxxxxxxxxxxx; Sev Binello
> Subject: Re: [NFS] export dir thru 2 diff path names
> 
> On Mon, Nov 10, 2008 at 03:20:42PM -0500, Chuck Lever wrote:
> > On Nov 10, 2008, at Nov 10, 2008, 2:28 PM, J. Bruce Fields wrote:
> >> On Mon, Nov 10, 2008 at 11:28:04AM -0800, Murata, Dennis wrote:
> >>> That really is the 64K question.  During my initial testing, I 
> >>> exported the parent directory.  Now I am explicitly exporting the 
> >>> installation directories, where I see the exportfs 
> message.  In the 
> >>> messages log file on the server the mount request from 
> the client is 
> >>> always the actual directory.
> >>
> >> I don't see how this would be "unsafe"--if it works, go for it.
> >>
> >> One potential trap: it's using the same client list and export 
> >> options for both, so if you think you can make one of them 
> read-only 
> >> and one of them writeable, for example, you'll be disapointed.
> >
> > I wonder how this behaves on the client side.  If the same client 
> > mounts both paths, will it recognize that these are the 
> same and use a 
> > shared page cache for both?
> 
> Yeah, who knows.  I suspect it assumes they're different if 
> the mount paths are different.
> 
> But for most people's purposes it probably doesn't matter 
> much.  (For the purposes people have mentioned so far they 
> don't even need to mount both paths from the same client at once.)
> 
> --b.
> 

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