ceph: protect access to d_parent

[pandora-kernel.git] / fs / ceph / dir.c

diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 883c954..ed296ec 100644 (file)
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -71,6 +71,21 @@ out_unlock:
        return 0;
 }
 
+struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry)
+{
+       struct inode *inode = NULL;
+
+       if (!dentry)
+               return NULL;
+
+       spin_lock(&dentry->d_lock);
+       if (dentry->d_parent) {
+               inode = dentry->d_parent->d_inode;
+               ihold(inode);
+       }
+       spin_unlock(&dentry->d_lock);
+       return inode;
+}
 
 
 /*