From: TARUISI Hiroaki <taruishi.hiroak@jp.fujitsu.com>
Date: Thu, 12 Nov 2009 07:14:26 +0000 (+0000)
Subject: Btrfs: deny sys_link across subvolumes.
X-Git-Tag: v2.6.33-rc1~7^2~1^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4a8be425a8fb8fbb5d881eb55fa6634c3463b9c9;p=pandora-kernel.git

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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