From: Miao Xie <miaox@cn.fujitsu.com>
Date: Wed, 15 May 2013 07:48:16 +0000 (+0000)
Subject: Btrfs: fix unprotected root node of the subvolume's inode rb-tree
X-Git-Tag: submit/tizen_common/20140905.094502~2561^2~86^2~6
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e1409cef85894f96f4bddc6633d64d1c5275e2a3;p=sdk%2Femulator%2Femulator-kernel.git

Btrfs: fix unprotected root node of the subvolume's inode rb-tree

The root node of the rb-tree may be changed, so we should get it under
the lock. Fix it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
---

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 790eceb48fb0..19eef3e852b0 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4843,14 +4843,13 @@ static void inode_tree_add(struct inode *inode)
 	struct rb_node **p;
 	struct rb_node *parent;
 	u64 ino = btrfs_ino(inode);
-again:
-	p = &root->inode_tree.rb_node;
-	parent = NULL;
 
 	if (inode_unhashed(inode))
 		return;
-
+again:
+	parent = NULL;
 	spin_lock(&root->inode_lock);
+	p = &root->inode_tree.rb_node;
 	while (*p) {
 		parent = *p;
 		entry = rb_entry(parent, struct btrfs_inode, rb_node);