1 /* -*- 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
38 #define OCFS2_DENTRY_LOCK_INO_START 18
39
40 enum 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,
46 OCFS2_LOCK_TYPE_DENTRY,
47 OCFS2_LOCK_TYPE_OPEN,
48 OCFS2_LOCK_TYPE_FLOCK,
49 OCFS2_LOCK_TYPE_QINFO,
50 OCFS2_NUM_LOCK_TYPES
51 };
52
ocfs2_lock_type_char(enum ocfs2_lock_type type)53 static inline char ocfs2_lock_type_char(enum ocfs2_lock_type type)
54 {
55 char c;
56 switch (type) {
57 case OCFS2_LOCK_TYPE_META:
58 c = 'M';
59 break;
60 case OCFS2_LOCK_TYPE_DATA:
61 c = 'D';
62 break;
63 case OCFS2_LOCK_TYPE_SUPER:
64 c = 'S';
65 break;
66 case OCFS2_LOCK_TYPE_RENAME:
67 c = 'R';
68 break;
69 case OCFS2_LOCK_TYPE_RW:
70 c = 'W';
71 break;
72 case OCFS2_LOCK_TYPE_DENTRY:
73 c = 'N';
74 break;
75 case OCFS2_LOCK_TYPE_OPEN:
76 c = 'O';
77 break;
78 case OCFS2_LOCK_TYPE_FLOCK:
79 c = 'F';
80 break;
81 case OCFS2_LOCK_TYPE_QINFO:
82 c = 'Q';
83 break;
84 default:
85 c = '\0';
86 }
87
88 return c;
89 }
90
91 static char *ocfs2_lock_type_strings[] = {
92 [OCFS2_LOCK_TYPE_META] = "Meta",
93 [OCFS2_LOCK_TYPE_DATA] = "Data",
94 [OCFS2_LOCK_TYPE_SUPER] = "Super",
95 [OCFS2_LOCK_TYPE_RENAME] = "Rename",
96 /* Need to differntiate from [R]ename.. serializing writes is the
97 * important job it does, anyway. */
98 [OCFS2_LOCK_TYPE_RW] = "Write/Read",
99 [OCFS2_LOCK_TYPE_DENTRY] = "Dentry",
100 [OCFS2_LOCK_TYPE_OPEN] = "Open",
101 [OCFS2_LOCK_TYPE_FLOCK] = "Flock",
102 [OCFS2_LOCK_TYPE_QINFO] = "Quota",
103 };
104
ocfs2_lock_type_string(enum ocfs2_lock_type type)105 static inline const char *ocfs2_lock_type_string(enum ocfs2_lock_type type)
106 {
107 #ifdef __KERNEL__
108 BUG_ON(type >= OCFS2_NUM_LOCK_TYPES);
109 #endif
110 return ocfs2_lock_type_strings[type];
111 }
112
113 #endif /* OCFS2_LOCKID_H */
114