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

On September 8, 2014 5:58:10 PM EDT, Rhialto <> wrote:
>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
>> 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
>> to work? I also tried this on FreeBSD 7.1 and got the same behavior;
>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.

Except that with NFS you export a *filesystem*, while nullfs talks about 
mapping a portion of the *namespace* instead.
If the man page is an accurate representation of how it's supposed to work, 
then all mounted filesystems should show up.  If not, then the man page could 
use some clarification.


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