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@xxxxxxxxxxxxxx>
---
fs/btrfs/inode.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 7f6e78a..bf5c399 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4839,14 +4839,13 @@ 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);
--
1.8.1.4
--
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