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