From c968264af7d18b87291805bea07ec06fb2bc1885 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] --- yaml --- r: 177846 b: refs/heads/master c:
 4a8be425a8fb8fbb5d881eb55fa6634c3463b9c9 h: refs/heads/master v: v3

---
 [refs]                 | 2 +-
 trunk/fs/btrfs/inode.c | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 3c4723715a7d..a75f840e2c43 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a7a3f7cadd9bdee569243f7ead9550aa16b60e07
+refs/heads/master: 4a8be425a8fb8fbb5d881eb55fa6634c3463b9c9
diff --git a/trunk/fs/btrfs/inode.c b/trunk/fs/btrfs/inode.c
index 168e8c040aab..da76cad92ecf 100644
--- a/trunk/fs/btrfs/inode.c
+++ b/trunk/fs/btrfs/inode.c
@@ -4462,6 +4462,10 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
 	if (inode->i_nlink == 0)
 		return -ENOENT;
 
+	/* do not allow sys_link's with other subvols of the same device */
+	if (root->objectid != BTRFS_I(inode)->root->objectid)
+		return -EPERM;
+
 	/*
 	 * 1 item for inode ref
 	 * 2 items for dir items