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authorMiao Xie <miaox@cn.fujitsu.com>2013-05-15 07:48:16 +0000
committerJosef Bacik <jbacik@fusionio.com>2013-05-17 21:40:30 -0400
commite1409cef85894f96f4bddc6633d64d1c5275e2a3 (patch)
tree712194a90f35e47e18f23b29cc630674befd5fc2
parent89042e5ad23d50449691141334f30d53d6271266 (diff)
downloadop-kernel-dev-e1409cef85894f96f4bddc6633d64d1c5275e2a3.zip
op-kernel-dev-e1409cef85894f96f4bddc6633d64d1c5275e2a3.tar.gz
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>
-rw-r--r--fs/btrfs/inode.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 790eceb..19eef3e 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);
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