mount --bind equivalent? mount_null broken or not?

[Jim Keller]

Hi Kris,
    Thanks for the response. Are you aware of any bugs in nullfs on 
FreeBSD 4? I'm still using 4.10/4.11 on a lot of servers. Although, as I 
mentioned, I've been using nullfs pretty heavily for a ProFTPD chroot 
for over 2 years now. I just don't want to suddenly get the bum's rush :)

-Jim Keller

Kris Kennaway wrote:

>On Sat, Oct 01, 2005 at 11:58:15PM -0400, Jim Keller wrote:
>  
>
>>I've been using mount_null for quite some time to mount filesystems 
>>beneath chroot jails, and have had no problems. However, the man page 
>>for mount_null has had a warning (since 1995, apparently) that "IT 
>>DOESN'T WORK", and I know OpenBSD has removed nullfs support as of 
>>version 3.7 (per 
>>http://archives.neohapsis.com/archives/openbsd/2005-09/0198.html). The 
>>bug listed in that thread doesn't appear to apply to FreeBSD, as I was 
>>able to successfully null mount /dev and list its contents. So my 
>>questions are:
>>
>>1. is nullfs actively supported on FreeBSD? If so, are there plans to 
>>continue supporting it?
>>    
>>
>
>Yes and yes.  In fact I don't know of any remaining nullfs bugs on
>FreeBSD 5 and above (although I only stress it on 6 and above), so the
>warning should just be removed.
>
>Kris
>  
>


Kris Kennaway wrote:

>On Sat, Oct 01, 2005 at 11:58:15PM -0400, Jim Keller wrote:
>  
>
>>I've been using mount_null for quite some time to mount filesystems 
>>beneath chroot jails, and have had no problems. However, the man page 
>>for mount_null has had a warning (since 1995, apparently) that "IT 
>>DOESN'T WORK", and I know OpenBSD has removed nullfs support as of 
>>version 3.7 (per 
>>http://archives.neohapsis.com/archives/openbsd/2005-09/0198.html). The 
>>bug listed in that thread doesn't appear to apply to FreeBSD, as I was 
>>able to successfully null mount /dev and list its contents. So my 
>>questions are:
>>
>>1. is nullfs actively supported on FreeBSD? If so, are there plans to 
>>continue supporting it?
>>    
>>
>
>Yes and yes.  In fact I don't know of any remaining nullfs bugs on
>FreeBSD 5 and above (although I only stress it on 6 and above), so the
>warning should just be removed.
>
>Kris
>  
>