ext4: add error checking to calls to ext4_handle_dirty_metadata()
[linux-2.6.git] / fs / ocfs2 / ocfs2_lockid.h
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
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
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 */