Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
ocfs2_lockid.h
Go to the documentation of this file.
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 */
Generated on Thu Jan 10 2013 14:49:31 for Linux Kernel by   doxygen 1.8.2