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

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

On Thu, Mar 08, 2007 at 10:39:23AM +1100, Neil Brown wrote:
> Imagine having hundreds of filesystems on some sort of library (a CD
> library?) where each can be identified by a UUID which gets stored in
> the fsid in the filehandle.
> Imagine a simple extension to mountd so that a call-out were made when
> an unknown filehandle arrived.  This callout could mount the required
> filesystem and export it.  Maybe the library only allows 3 filesystems
> to be mounted at a time, so it would unmount the lease-recently-used
> one.

Maybe.  Is this practical?  Do we know of any cases of users doing this?
Do you block forever if you try to access 4 filesystems at once?  I
dunno....

> I have often wanted to write a 'Linux commentary' that explains all
> the hows and whys of things.  I even started some bits once (to help
> me understand the VFS layer).  But Linux changes so fast that any
> entry in such a commentary would be out-of-date before it was
> written....

And there's a lot to document.  I mean, look:

	http://www.oreilly.com/catalog/understandlni/

Just over a thousand pages, just covering the kernel networking code
(and only some of it at that).  Maybe they just lost the forest for the
trees, but still, yipes.

--b.

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