1 files changed, 79 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/include/lustre_linkea.h b/drivers/staging/lustre/lustre/include/lustre_linkea.h
new file mode 100644
index 000000000000..249e8bf4fa22
--- /dev/null
+++ b/drivers/staging/lustre/lustre/include/lustre_linkea.h
@@ -0,0 +1,79 @@
+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.gnu.org/licenses/gpl-2.0.html
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2013, 2014, Intel Corporation.
+ * Use is subject to license terms.
+ *
+ * Author: di wang <di.wang@intel.com>
+ */
+
+#define DEFAULT_LINKEA_SIZE	4096
+
+struct linkea_data {
+	/**
+	 * Buffer to keep link EA body.
+	 */
+	struct lu_buf		*ld_buf;
+	/**
+	 * The matched header, entry and its length in the EA
+	 */
+	struct link_ea_header	*ld_leh;
+	struct link_ea_entry	*ld_lee;
+	int			ld_reclen;
+};
+
+int linkea_data_new(struct linkea_data *ldata, struct lu_buf *buf);
+int linkea_init(struct linkea_data *ldata);
+void linkea_entry_unpack(const struct link_ea_entry *lee, int *reclen,
+			 struct lu_name *lname, struct lu_fid *pfid);
+int linkea_entry_pack(struct link_ea_entry *lee, const struct lu_name *lname,
+		      const struct lu_fid *pfid);
+int linkea_add_buf(struct linkea_data *ldata, const struct lu_name *lname,
+		   const struct lu_fid *pfid);
+void linkea_del_buf(struct linkea_data *ldata, const struct lu_name *lname);
+int linkea_links_find(struct linkea_data *ldata, const struct lu_name *lname,
+		      const struct lu_fid  *pfid);
+
+static inline void linkea_first_entry(struct linkea_data *ldata)
+{
+	LASSERT(ldata);
+	LASSERT(ldata->ld_leh);
+
+	if (ldata->ld_leh->leh_reccount == 0)
+		ldata->ld_lee = NULL;
+	else
+		ldata->ld_lee = (struct link_ea_entry *)(ldata->ld_leh + 1);
+}
+
+static inline void linkea_next_entry(struct linkea_data *ldata)
+{
+	LASSERT(ldata);
+	LASSERT(ldata->ld_leh);
+
+	if (ldata->ld_lee) {
+		ldata->ld_lee = (struct link_ea_entry *)((char *)ldata->ld_lee +
+							 ldata->ld_reclen);
+		if ((char *)ldata->ld_lee >= ((char *)ldata->ld_leh +
+					      ldata->ld_leh->leh_len))
+			ldata->ld_lee = NULL;
+	}
+}