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Re: nullfs: contents under mount point not visible via null mount

On Mon 08 Sep 2014 at 13:44:28 -0400, Toby Karyadi wrote:
> Say, if I have the following:
> - a path a/b/c/d
> - a/b/c/d is a mount point for some filesystem
> - an alternate path alt-hier/c, which is a null mount for a/b/c
> Then, listing alt-hier/c/d won't show the content of the filesystem mounted
> on a/b/c/d. This is surprising, since I thought that I'd see the content of
> a/b/c/d. Is this a bug, or my misunderstanding of how the nullfs is supposed
> to work? I also tried this on FreeBSD 7.1 and got the same behavior; hmmpfh.

I believe that is a general effect. You'd see it with NFS too: if you
export a/b/c to some client, it will not see whatever the server has
mounted on a/b/c/d.

You can always do an extra null mount on alt-hier/c/d, which is the same
solution as for NFS.

The reasoning is, I think, that a/b/c/d is a different file system from
a/b/c, and hence it is not included in the nfs export or null re-mount
(which is also a file system export of a kind).

___ Olaf 'Rhialto' Seibert  -- The Doctor: No, 'eureka' is Greek for
\X/ rhialto/at/    -- 'this bath is too hot.'

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