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Mark Fashehccd979b2005-12-15 14:31:24 -08001/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * ocfs2_lockid.h
5 *
6 * Defines OCFS2 lockid bits.
7 *
8 * Copyright (C) 2002, 2005 Oracle. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 */
25
26#ifndef OCFS2_LOCKID_H
27#define OCFS2_LOCKID_H
28
29/* lock ids are made up in the following manner:
30 * name[0] --> type
31 * name[1-6] --> 6 pad characters, reserved for now
32 * name[7-22] --> block number, expressed in hex as 16 chars
33 * name[23-30] --> i_generation, expressed in hex 8 chars
34 * name[31] --> '\0' */
35#define OCFS2_LOCK_ID_MAX_LEN 32
36#define OCFS2_LOCK_ID_PAD "000000"
37
Mark Fashehd680efe2006-09-08 14:14:34 -070038#define OCFS2_DENTRY_LOCK_INO_START 18
39
Mark Fashehccd979b2005-12-15 14:31:24 -080040enum ocfs2_lock_type {
41 OCFS2_LOCK_TYPE_META = 0,
42 OCFS2_LOCK_TYPE_DATA,
43 OCFS2_LOCK_TYPE_SUPER,
44 OCFS2_LOCK_TYPE_RENAME,
45 OCFS2_LOCK_TYPE_RW,
Mark Fashehd680efe2006-09-08 14:14:34 -070046 OCFS2_LOCK_TYPE_DENTRY,
Tiger Yang50008632007-03-20 16:01:38 -070047 OCFS2_LOCK_TYPE_OPEN,
Mark Fashehcf8e06f2007-12-20 16:43:10 -080048 OCFS2_LOCK_TYPE_FLOCK,
Mark Fashehccd979b2005-12-15 14:31:24 -080049 OCFS2_NUM_LOCK_TYPES
50};
51
52static inline char ocfs2_lock_type_char(enum ocfs2_lock_type type)
53{
54 char c;
55 switch (type) {
56 case OCFS2_LOCK_TYPE_META:
57 c = 'M';
58 break;
59 case OCFS2_LOCK_TYPE_DATA:
60 c = 'D';
61 break;
62 case OCFS2_LOCK_TYPE_SUPER:
63 c = 'S';
64 break;
65 case OCFS2_LOCK_TYPE_RENAME:
66 c = 'R';
67 break;
68 case OCFS2_LOCK_TYPE_RW:
69 c = 'W';
70 break;
Mark Fashehd680efe2006-09-08 14:14:34 -070071 case OCFS2_LOCK_TYPE_DENTRY:
72 c = 'N';
73 break;
Tiger Yang50008632007-03-20 16:01:38 -070074 case OCFS2_LOCK_TYPE_OPEN:
75 c = 'O';
76 break;
Mark Fashehcf8e06f2007-12-20 16:43:10 -080077 case OCFS2_LOCK_TYPE_FLOCK:
78 c = 'F';
79 break;
Mark Fashehccd979b2005-12-15 14:31:24 -080080 default:
81 c = '\0';
82 }
83
84 return c;
85}
86
Mark Fashehd680efe2006-09-08 14:14:34 -070087static char *ocfs2_lock_type_strings[] = {
88 [OCFS2_LOCK_TYPE_META] = "Meta",
89 [OCFS2_LOCK_TYPE_DATA] = "Data",
90 [OCFS2_LOCK_TYPE_SUPER] = "Super",
91 [OCFS2_LOCK_TYPE_RENAME] = "Rename",
92 /* Need to differntiate from [R]ename.. serializing writes is the
93 * important job it does, anyway. */
94 [OCFS2_LOCK_TYPE_RW] = "Write/Read",
95 [OCFS2_LOCK_TYPE_DENTRY] = "Dentry",
Tiger Yang50008632007-03-20 16:01:38 -070096 [OCFS2_LOCK_TYPE_OPEN] = "Open",
Mark Fashehcf8e06f2007-12-20 16:43:10 -080097 [OCFS2_LOCK_TYPE_FLOCK] = "Flock",
Mark Fashehd680efe2006-09-08 14:14:34 -070098};
99
100static inline const char *ocfs2_lock_type_string(enum ocfs2_lock_type type)
101{
102#ifdef __KERNEL__
Joel Becker8f318312008-03-04 16:09:39 -0800103 BUG_ON(type >= OCFS2_NUM_LOCK_TYPES);
Mark Fashehd680efe2006-09-08 14:14:34 -0700104#endif
105 return ocfs2_lock_type_strings[type];
106}
107
Mark Fashehccd979b2005-12-15 14:31:24 -0800108#endif /* OCFS2_LOCKID_H */