From 4a8be425a8fb8fbb5d881eb55fa6634c3463b9c9 Mon Sep 17 00:00:00 2001
From: TARUISI Hiroaki <taruishi.hiroak@jp.fujitsu.com>
Date: Thu, 12 Nov 2009 07:14:26 +0000
Subject: [PATCH] Btrfs: deny sys_link across subvolumes.

I rebased Christian Parpart's patch to deny hard link across
subvolumes. Original patch modifies also btrfs_rename, but
I excluded it because we can move across subvolumes now and
it make no problem.
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Hard link across subvolumes should not allowed in Btrfs.
btrfs_link checks root of 'to' directory is same as root
of 'from' file. If not same, btrfs_link returns -EPERM.

Signed-off-by: TARUISI Hiroaki <taruishi.hiroak@jp.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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