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