Buggered-in: 
76dda93c6ae2 ("Btrfs: add snapshot/subvolume destroy
ioctl")
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Chris Mason <chris.mason@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 static struct dentry *btrfs_get_parent(struct dentry *child)
 {
        struct inode *dir = child->d_inode;
-       static struct dentry *dentry;
+       struct dentry *dentry;
        struct btrfs_root *root = BTRFS_I(dir)->root;
        struct btrfs_path *path;
        struct extent_buffer *leaf;