On Wed, Nov 12, 2008 at 10:04:30AM -0800, Murata, Dennis wrote:
> One last question for the maintainers and the community. Is this viewed
> as an undocumented feature or a bug to be fixed?
By "this" you mean mountd's current practice of following symlinks in
export points? If people are using it (and I can't imagine you're the
only ones to try), then I think we should make it a point to keep it
around. Patches to the documentation (probably the exports man page,
kept in the nfs-utils code) welcomed.
--b.
> 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:[email protected]]
> > Sent: Monday, November 10, 2008 2:45 PM
> > To: Chuck Lever
> > Cc: Murata, Dennis; [email protected]; 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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> -----Original Message-----
> From: J. Bruce Fields [mailto:[email protected]]
> Sent: Sunday, November 16, 2008 2:04 PM
> To: Murata, Dennis
> Cc: Chuck Lever; [email protected]; Sev Binello
> Subject: Re: [NFS] export dir thru 2 diff path names
>
> On Wed, Nov 12, 2008 at 10:04:30AM -0800, Murata, Dennis wrote:
> > One last question for the maintainers and the community. Is this
> > viewed as an undocumented feature or a bug to be fixed?
>
> By "this" you mean mountd's current practice of following
> symlinks in export points? If people are using it (and I
> can't imagine you're the only ones to try), then I think we
> should make it a point to keep it around. Patches to the
> documentation (probably the exports man page, kept in the
> nfs-utils code) welcomed.
>
> --b.
The "following symlinks" is a part of what I am asking, but the other
point is the idea of exporting a directory with two different path
names. I didn't know if the message from exportfs, i.e. duplicated
export entries, was designed as a warning or an error. As you pointed
out, at any particular client workstation the directory would probably
be mounted by only one of the names, but a different workstation may use
the other name, so the directory would have to be exported by both names
from the server. I am still working out the details, but in my
situation it may be possible that the directory will only be exported by
one of the names depending on the stage of the process it is in.
Wayne
>
> > 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:[email protected]]
> > > Sent: Monday, November 10, 2008 2:45 PM
> > > To: Chuck Lever
> > > Cc: Murata, Dennis; [email protected]; 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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