+/* We need to hold the inode semaphore over the dcache lookup itself, or we
+ * run the risk of entering the filesystem lookup path concurrently on SMP
+ * systems, and instantiating two inodes for the same entry. We still
+ * protect against concurrent addition/removal races with the DLM locking.
+ */
+static inline struct dentry *
+ll_lookup_one_len(const char *fid_name, struct dentry *dparent,
+ int fid_namelen)
+{
+ struct dentry *dchild;
+
+ inode_lock(dparent->d_inode);
+ dchild = lookup_one_len(fid_name, dparent, fid_namelen);
+ inode_unlock(dparent->d_inode);
+
+ if (IS_ERR(dchild) || dchild->d_inode == NULL)
+ return dchild;
+
+ if (is_bad_inode(dchild->d_inode)) {
+ CERROR("bad inode returned %lu/%u\n",
+ dchild->d_inode->i_ino, dchild->d_inode->i_generation);
+ dput(dchild);
+ dchild = ERR_PTR(-ENOENT);
+ }
+
+ return dchild;
+}
+