[PATCH] OCFS2: The Second Oracle Cluster Filesystem

[powerpc.git] / fs / ocfs2 / ocfs2_lockid.h

diff --git a/fs/ocfs2/ocfs2_lockid.h b/fs/ocfs2/ocfs2_lockid.h
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+++ b/fs/ocfs2/ocfs2_lockid.h
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+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * ocfs2_lockid.h
+ *
+ * Defines OCFS2 lockid bits.
+ *
+ * Copyright (C) 2002, 2005 Oracle.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * 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 for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#ifndef OCFS2_LOCKID_H
+#define OCFS2_LOCKID_H
+
+/* lock ids are made up in the following manner:
+ * name[0]     --> type
+ * name[1-6]   --> 6 pad characters, reserved for now
+ * name[7-22]  --> block number, expressed in hex as 16 chars
+ * name[23-30] --> i_generation, expressed in hex 8 chars
+ * name[31]    --> '\0' */
+#define OCFS2_LOCK_ID_MAX_LEN  32
+#define OCFS2_LOCK_ID_PAD "000000"
+
+enum ocfs2_lock_type {
+       OCFS2_LOCK_TYPE_META = 0,
+       OCFS2_LOCK_TYPE_DATA,
+       OCFS2_LOCK_TYPE_SUPER,
+       OCFS2_LOCK_TYPE_RENAME,
+       OCFS2_LOCK_TYPE_RW,
+       OCFS2_NUM_LOCK_TYPES
+};
+
+static inline char ocfs2_lock_type_char(enum ocfs2_lock_type type)
+{
+       char c;
+       switch (type) {
+               case OCFS2_LOCK_TYPE_META:
+                       c = 'M';
+                       break;
+               case OCFS2_LOCK_TYPE_DATA:
+                       c = 'D';
+                       break;
+               case OCFS2_LOCK_TYPE_SUPER:
+                       c = 'S';
+                       break;
+               case OCFS2_LOCK_TYPE_RENAME:
+                       c = 'R';
+                       break;
+               case OCFS2_LOCK_TYPE_RW:
+                       c = 'W';
+                       break;
+               default:
+                       c = '\0';
+       }
+
+       return c;
+}
+
+#endif  /* OCFS2_LOCKID_H */