LU-6388 utils: make llog_reader parse changelogs

[fs/lustre-release.git] / lustre / include / lustre_log_user.h

diff --git a/lustre/include/lustre_log_user.h b/lustre/include/lustre_log_user.h
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+++ b/lustre/include/lustre_log_user.h
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+/*
+ * 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) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2012, 2014, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ *
+ * lustre/include/lustre_log_user.h
+ *
+ * Userspace-usable portion of Generic infrastructure for managing
+ * a collection of logs.
+ * See lustre_log.h for more details.
+ */
+
+#ifndef _LUSTRE_LOG_USER_H
+#define _LUSTRE_LOG_USER_H
+
+/*  Lustre logs use FIDs constructed from oi_id and oi_seq directly,
+ *  without attempting to use the IGIF and IDIF ranges as is done
+ *  elsewhere, because of compatibility concerns (see lu-2888).
+ */
+
+static inline void logid_to_fid(struct llog_logid *id, struct lu_fid *fid)
+{
+       /* For compatibility purposes we identify pre-OSD (~< 2.3.51 MDS)
+        * logid's by non-zero ogen (inode generation) and convert them
+        * into IGIF */
+       if (id->lgl_ogen == 0) {
+               fid->f_seq = id->lgl_oi.oi.oi_seq;
+               fid->f_oid = id->lgl_oi.oi.oi_id;
+               fid->f_ver = 0;
+       } else {
+               lu_igif_build(fid, id->lgl_oi.oi.oi_id, id->lgl_ogen);
+       }
+}
+
+static inline void fid_to_logid(struct lu_fid *fid, struct llog_logid *id)
+{
+       id->lgl_oi.oi.oi_seq = fid->f_seq;
+       id->lgl_oi.oi.oi_id = fid->f_oid;
+       id->lgl_ogen = 0;
+}
+
+static inline void logid_set_id(struct llog_logid *log_id, __u64 id)
+{
+       log_id->lgl_oi.oi.oi_id = id;
+}
+
+static inline __u64 logid_id(struct llog_logid *log_id)
+{
+       return log_id->lgl_oi.oi.oi_id;
+}
+
+#endif /* ifndef _LUSTRE_LOG_USER_H */