Re: [unionfs][patch] improvements of the unionfs - Problem Report, kern/91010

[Masanori OZAWA <ozawa_(_at_)_ongs_(_dot_)_co_(_dot_)_jp>]

Danny Braniss wrote:
> > Masanori OZAWA wrote:
> > [...]
> >
> > Nice work! This is just a "works for me". In only find some issues with
> > permissions that were already present in the previous implementation of
> > unionfs. Some of them are partially corrected in the "useful" copymode.
> > I mailed the details to the author.
>
>
> the following will hang the kernel:
> 	root is mounted nfs,
> 	/etc is unionfs'ed so:
> 	from /etc/rc.initdiskless:
> 		...
> 		# Create a generic memory disk
> 		#
> 		mount_md() {
> 		    /sbin/mdmfs -i 4096 -s $1 -M md $2
> 		}
> 		kldload unionfs
> 		mount_md 4096 /.etc
> 		mount_unionfs /.etc /etc
> 		...
> 	and now:
> 		cd /etc
> 		mv some-file somefile
> and now the system is stuck.
> this behaviour is also present in the unpatched unionfs, but would be nice
> if it can be fixed.
>
> 	danny
> ps: see http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/84107

Okey. I found the cause of this problem. I fixed it  :)

http://people.freebsd.org/~daichi/unionfs/unionfs-p2.diff

I am getting a edit of HP around my improvements of unionfs
bacause someone have pointed out that your explanation is
not enough.

--
  ONGS Inc.
  Masanori OZAWA (ozawa_(_at_)_ongs_(_dot_)_co_(_dot_)_jp)
  WWW: http://www.ongs.co.jp/
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