Re: Delays on "first" access to a NFS mount

["J. Bruce Fields" <bfields@fieldses.org>]

On Thu, Mar 08, 2007 at 09:37:18AM +1100, Neil Brown wrote:
> On Wednesday March 7, bfields@fieldses.org wrote:
> > 
> > Well, non-head-hurty ideas always welcomed.  I've got two export-related
> > problems to fix:
> > 
> > 	- Our current NFSv4 pseudofs fsid=0 hack is a pain to administer
> > 	  and results in inconsistent paths across different NFS
> > 	  versions.
> 
> You've got to put that v4 pseudo root somewhere...
> It just needs cleverness in nfs-utils to auto-bind-mount things into
> the pseudoroot...

I've got make-mountd-clever patches here; if I can get them working in
the next couple days then I'll pass them along so people can see what
they're doing.

> but I guess people cannot magically unmount things then.
>
> How about this.  We add an export option "follow-symlinks" so that
> when nfsd is asked to stat a symlink it does a 'stat' instead of an
> 'lstat' (effectively).
> Then we get mountd to make a tmpfs in /var/lib/nfs/pseudoroot which
> contains directories and symlinks to the various export points names
> in etab.  This tmpfs is exported as fsid=0,follow-symlinks.
> 
> Problem solved?

Maybe.  Getting those symlink/mountpoints right sounds tricky.

How different is this from the in-kernel automounting that the NFS
client is using for fsid traversal, for example?

> Ofcourse if different clients get to see different exports, then we
> might need multiple tmpfs's in /var/lib/nfs/pseudoroot/$CLIENT/ ....

Ugh.  Is this something a lot of people do?

--b.

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