BUG: Link from sub volume, then remove the subvolume -> wrong link

[Goffredo Baroncelli <kreijack@libero.it>]

Hi all

when I tried to reproduce the bug highlighted by Andrew, I discovered another 
bug. When I link a file from a subvolume to another, then remove the subvolume 
I got a wrong link: in my test an *hard* link becomes a *soft* link !!!!

Steps to reproduce the bug:

	root@venice:/tmp/test# sudo btrfsctl -S subvol2 .
	operation complete
	Btrfs Btrfs v0.19
	root@venice:/tmp/test# echo 123 >>subvol2/myfile
	root@venice:/tmp/test# ln subvol2/myfile .
	root@venice:/tmp/test# ls -l . subvol2/
	.:
	total 4
	-rw-r--r-- 2 root root  4 2009-12-11 20:40 myfile
	drwx------ 1 root root 12 2009-12-11 20:40 subvol2

	subvol2/:
	total 4
	-rw-r--r-- 2 root root 4 2009-12-11 20:40 myfile
	root@venice:/tmp/test# btrfsctl -D subvol2 .
	operation complete
	Btrfs Btrfs v0.19
	root@venice:/tmp/test# ls -l
	total 0
	lrwxrwxrwx 1 root root 3 2009-11-22 10:56 myfile -> lib

Now myfile is a soft link instead to a hard link!!!! Moreover the soft link is 
to an incorrect target ( 1) lib doesn't exist, 2) in any case is not the right 
target).


BR
Goffredo
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