Subject: Re: TMPFS and UNION
To: Steven M. Bellovin <>
From: MASUDA Hideo <>
List: tech-kern
Date: 12/08/2005 08:31:02
Hi, again.

Steven M. Bellovin wrote:
>># uname -a
>>NetBSD xenu 3.99.13 NetBSD 3.99.13 (DSM_XENU) #1: Wed Dec 7 16:59:56 JST 2005
>>XENU i386
>># mount -t mfs -o -s=10240,-p=755 none /.var
>># mount -t union /.var /var
>>Using mfs is OK, but,
>># mount -t tmpfs -o -m=755 none /.var
>># mount -t union /.var /var
>>mount_union: /.var on /var: Operation not supported
>>Any idea?
> I posted about that a few months ago -- it's just not supported.

  Oh, I miss the article. Thank you for your comment.

Jaromir Dolecek wrote:
 > The underlying FS must support whiteouts, which tmpfs probably does not.

  I see. Does anyone work for it?

Thank you in advance.