Re: don't use wapbl (-o log) on / (/dev)

["Steven M. Bellovin" <smb%cs.columbia.edu@localhost>]

On Mon, 16 Feb 2009 00:28:01 +0900
FUKAUMI Naoki <fun%naobsd.org@localhost> wrote:

> At Mon, 16 Feb 2009 00:23:22 +0900,
> FUKAUMI Naoki wrote:
> > don't use wapbl (-o log) on / (/dev) because it leads silent data
> > corruption on (at least) msdosfs. it was introduced in
> > 
> >   
> > http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/ufs/ffs/ffs_vnops.c.diff?r1=1.105&r2=1.106
> >   
> > http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/ufs/ffs/ffs_vnops.c.diff?r1=1.104.4.1&r2=1.104.4.2
> 
> do
> 
>   $ mount_msdos XXX /mnt
>   $ cp non-empty-file /mnt/
>   $ umount /mnt
>   $ mount_msdos XXX /mnt
>   $ ls -l /mnt/
> 
> then you can see 0 byte non-empty-file.
> 
And where does the wapabl come in?  The file system where /dev exists?
Strange...

                --Steve Bellovin, http://www.cs.columbia.edu/~smb