+/** Read the link EA into a temp buffer.
+ * Uses the mdd_thread_info::mti_big_buf since it is generally large.
+ * A pointer to the buffer is stored in \a ldata::ld_buf.
+ *
+ * \retval 0 or error
+ */
+static int __mdd_links_read(const struct lu_env *env,
+ struct mdd_object *mdd_obj,
+ struct linkea_data *ldata)
+{
+ int rc;
+
+ if (!mdd_object_exists(mdd_obj))
+ return -ENODATA;
+
+ /* First try a small buf */
+ LASSERT(env != NULL);
+ ldata->ld_buf = lu_buf_check_and_alloc(&mdd_env_info(env)->mti_link_buf,
+ PAGE_SIZE);
+ if (ldata->ld_buf->lb_buf == NULL)
+ return -ENOMEM;
+
+ rc = mdo_xattr_get(env, mdd_obj, ldata->ld_buf, XATTR_NAME_LINK);
+ if (rc == -ERANGE) {
+ /* Buf was too small, figure out what we need. */
+ lu_buf_free(ldata->ld_buf);
+ rc = mdo_xattr_get(env, mdd_obj, ldata->ld_buf,
+ XATTR_NAME_LINK);
+ if (rc < 0)
+ return rc;
+ ldata->ld_buf = lu_buf_check_and_alloc(ldata->ld_buf, rc);
+ if (ldata->ld_buf->lb_buf == NULL)
+ return -ENOMEM;
+ rc = mdo_xattr_get(env, mdd_obj, ldata->ld_buf,
+ XATTR_NAME_LINK);
+ }
+ if (rc < 0) {
+ lu_buf_free(ldata->ld_buf);
+ ldata->ld_buf = NULL;
+ return rc;
+ }
+
+ return linkea_init(ldata);
+}
+
+static int mdd_links_read(const struct lu_env *env,
+ struct mdd_object *mdd_obj,
+ struct linkea_data *ldata)
+{
+ int rc;
+
+ rc = __mdd_links_read(env, mdd_obj, ldata);
+ if (!rc)
+ rc = linkea_init(ldata);
+
+ return rc;
+}
+
+static int mdd_links_read_with_rec(const struct lu_env *env,
+ struct mdd_object *mdd_obj,
+ struct linkea_data *ldata)
+{
+ int rc;
+
+ rc = __mdd_links_read(env, mdd_obj, ldata);
+ if (!rc)
+ rc = linkea_init_with_rec(ldata);
+
+ return rc;
+}
+
+/**
+ * Get parent FID of the directory
+ *
+ * Read parent FID from linkEA, if that fails, then do lookup
+ * dotdot to get the parent FID.
+ *
+ * \param[in] env execution environment
+ * \param[in] obj object from which to find the parent FID
+ * \param[in] attr attribute of the object
+ * \param[out] fid fid to get the parent FID
+ *
+ * \retval 0 if getting the parent FID succeeds.
+ * \retval negative errno if getting the parent FID fails.
+ **/