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_LOCK_TYPE_NFS_SYNC,
51 OCFS2_LOCK_TYPE_ORPHAN_SCAN,
52 OCFS2_LOCK_TYPE_REFCOUNT,
53 OCFS2_LOCK_TYPE_TRIM_FS,
54 OCFS2_NUM_LOCK_TYPES
55 };
56
ocfs2_lock_type_char(enum ocfs2_lock_type type)57 static inline char ocfs2_lock_type_char(enum ocfs2_lock_type type)
58 {
59 char c;
60 switch (type) {
61 case OCFS2_LOCK_TYPE_META:
62 c = 'M';
63 break;
64 case OCFS2_LOCK_TYPE_DATA:
65 c = 'D';
66 break;
67 case OCFS2_LOCK_TYPE_SUPER:
68 c = 'S';
69 break;
70 case OCFS2_LOCK_TYPE_RENAME:
71 c = 'R';
72 break;
73 case OCFS2_LOCK_TYPE_RW:
74 c = 'W';
75 break;
76 case OCFS2_LOCK_TYPE_DENTRY:
77 c = 'N';
78 break;
79 case OCFS2_LOCK_TYPE_OPEN:
80 c = 'O';
81 break;
82 case OCFS2_LOCK_TYPE_FLOCK:
83 c = 'F';
84 break;
85 case OCFS2_LOCK_TYPE_QINFO:
86 c = 'Q';
87 break;
88 case OCFS2_LOCK_TYPE_NFS_SYNC:
89 c = 'Y';
90 break;
91 case OCFS2_LOCK_TYPE_ORPHAN_SCAN:
92 c = 'P';
93 break;
94 case OCFS2_LOCK_TYPE_REFCOUNT:
95 c = 'T';
96 break;
97 case OCFS2_LOCK_TYPE_TRIM_FS:
98 c = 'I';
99 break;
100 default:
101 c = '\0';
102 }
103
104 return c;
105 }
106
107 static char *ocfs2_lock_type_strings[] = {
108 [OCFS2_LOCK_TYPE_META] = "Meta",
109 [OCFS2_LOCK_TYPE_DATA] = "Data",
110 [OCFS2_LOCK_TYPE_SUPER] = "Super",
111 [OCFS2_LOCK_TYPE_RENAME] = "Rename",
112 /* Need to differntiate from [R]ename.. serializing writes is the
113 * important job it does, anyway. */
114 [OCFS2_LOCK_TYPE_RW] = "Write/Read",
115 [OCFS2_LOCK_TYPE_DENTRY] = "Dentry",
116 [OCFS2_LOCK_TYPE_OPEN] = "Open",
117 [OCFS2_LOCK_TYPE_FLOCK] = "Flock",
118 [OCFS2_LOCK_TYPE_QINFO] = "Quota",
119 [OCFS2_LOCK_TYPE_NFS_SYNC] = "NFSSync",
120 [OCFS2_LOCK_TYPE_ORPHAN_SCAN] = "OrphanScan",
121 [OCFS2_LOCK_TYPE_REFCOUNT] = "Refcount",
122 [OCFS2_LOCK_TYPE_TRIM_FS] = "TrimFs",
123 };
124
ocfs2_lock_type_string(enum ocfs2_lock_type type)125 static inline const char *ocfs2_lock_type_string(enum ocfs2_lock_type type)
126 {
127 #ifdef __KERNEL__
128 BUG_ON(type >= OCFS2_NUM_LOCK_TYPES);
129 #endif
130 return ocfs2_lock_type_strings[type];
131 }
132
133 #endif /* OCFS2_LOCKID_H */
134