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1/******************************************************************************
2*******************************************************************************
3**
4** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
5** Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
6**
7** This copyrighted material is made available to anyone wishing to use,
8** modify, copy, or redistribute it subject to the terms and conditions
9** of the GNU General Public License v.2.
10**
11*******************************************************************************
12******************************************************************************/
13
14#ifndef __DLMCONSTANTS_DOT_H__
15#define __DLMCONSTANTS_DOT_H__
16
17/*
18 * Constants used by DLM interface.
19 */
20
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21#define DLM_LOCKSPACE_LEN 64
22#define DLM_RESNAME_MAXLEN 64
23
24
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25/*
26 * Lock Modes
27 */
28
29#define DLM_LOCK_IV (-1) /* invalid */
30#define DLM_LOCK_NL 0 /* null */
31#define DLM_LOCK_CR 1 /* concurrent read */
32#define DLM_LOCK_CW 2 /* concurrent write */
33#define DLM_LOCK_PR 3 /* protected read */
34#define DLM_LOCK_PW 4 /* protected write */
35#define DLM_LOCK_EX 5 /* exclusive */
36
37
38/*
39 * Flags to dlm_lock
40 *
41 * DLM_LKF_NOQUEUE
42 *
43 * Do not queue the lock request on the wait queue if it cannot be granted
44 * immediately. If the lock cannot be granted because of this flag, DLM will
45 * either return -EAGAIN from the dlm_lock call or will return 0 from
46 * dlm_lock and -EAGAIN in the lock status block when the AST is executed.
47 *
48 * DLM_LKF_CANCEL
49 *
50 * Used to cancel a pending lock request or conversion. A converting lock is
51 * returned to its previously granted mode.
52 *
53 * DLM_LKF_CONVERT
54 *
55 * Indicates a lock conversion request. For conversions the name and namelen
56 * are ignored and the lock ID in the LKSB is used to identify the lock.
57 *
58 * DLM_LKF_VALBLK
59 *
60 * Requests DLM to return the current contents of the lock value block in the
61 * lock status block. When this flag is set in a lock conversion from PW or EX
62 * modes, DLM assigns the value specified in the lock status block to the lock
63 * value block of the lock resource. The LVB is a DLM_LVB_LEN size array
64 * containing application-specific information.
65 *
66 * DLM_LKF_QUECVT
67 *
68 * Force a conversion request to be queued, even if it is compatible with
69 * the granted modes of other locks on the same resource.
70 *
71 * DLM_LKF_IVVALBLK
72 *
73 * Invalidate the lock value block.
74 *
75 * DLM_LKF_CONVDEADLK
76 *
77 * Allows the dlm to resolve conversion deadlocks internally by demoting the
78 * granted mode of a converting lock to NL. The DLM_SBF_DEMOTED flag is
79 * returned for a conversion that's been effected by this.
80 *
81 * DLM_LKF_PERSISTENT
82 *
83 * Only relevant to locks originating in userspace. A persistent lock will not
84 * be removed if the process holding the lock exits.
85 *
86 * DLM_LKF_NODLCKWT
87 *
88 * Do not cancel the lock if it gets into conversion deadlock.
89 * Exclude this lock from being monitored due to DLM_LSFL_TIMEWARN.
90 *
91 * DLM_LKF_NODLCKBLK
92 *
93 * net yet implemented
94 *
95 * DLM_LKF_EXPEDITE
96 *
97 * Used only with new requests for NL mode locks. Tells the lock manager
98 * to grant the lock, ignoring other locks in convert and wait queues.
99 *
100 * DLM_LKF_NOQUEUEBAST
101 *
102 * Send blocking AST's before returning -EAGAIN to the caller. It is only
103 * used along with the NOQUEUE flag. Blocking AST's are not sent for failed
104 * NOQUEUE requests otherwise.
105 *
106 * DLM_LKF_HEADQUE
107 *
108 * Add a lock to the head of the convert or wait queue rather than the tail.
109 *
110 * DLM_LKF_NOORDER
111 *
112 * Disregard the standard grant order rules and grant a lock as soon as it
113 * is compatible with other granted locks.
114 *
115 * DLM_LKF_ORPHAN
116 *
2ab4bd8e 117 * Acquire an orphan lock.
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118 *
119 * DLM_LKF_ALTPR
120 *
121 * If the requested mode cannot be granted immediately, try to grant the lock
122 * in PR mode instead. If this alternate mode is granted instead of the
123 * requested mode, DLM_SBF_ALTMODE is returned in the lksb.
124 *
125 * DLM_LKF_ALTCW
126 *
127 * The same as ALTPR, but the alternate mode is CW.
128 *
129 * DLM_LKF_FORCEUNLOCK
130 *
131 * Unlock the lock even if it is converting or waiting or has sublocks.
132 * Only really for use by the userland device.c code.
133 *
134 */
135
136#define DLM_LKF_NOQUEUE 0x00000001
137#define DLM_LKF_CANCEL 0x00000002
138#define DLM_LKF_CONVERT 0x00000004
139#define DLM_LKF_VALBLK 0x00000008
140#define DLM_LKF_QUECVT 0x00000010
141#define DLM_LKF_IVVALBLK 0x00000020
142#define DLM_LKF_CONVDEADLK 0x00000040
143#define DLM_LKF_PERSISTENT 0x00000080
144#define DLM_LKF_NODLCKWT 0x00000100
145#define DLM_LKF_NODLCKBLK 0x00000200
146#define DLM_LKF_EXPEDITE 0x00000400
147#define DLM_LKF_NOQUEUEBAST 0x00000800
148#define DLM_LKF_HEADQUE 0x00001000
149#define DLM_LKF_NOORDER 0x00002000
150#define DLM_LKF_ORPHAN 0x00004000
151#define DLM_LKF_ALTPR 0x00008000
152#define DLM_LKF_ALTCW 0x00010000
153#define DLM_LKF_FORCEUNLOCK 0x00020000
154#define DLM_LKF_TIMEOUT 0x00040000
155
156/*
157 * Some return codes that are not in errno.h
158 */
159
160#define DLM_ECANCEL 0x10001
161#define DLM_EUNLOCK 0x10002
162
163#endif /* __DLMCONSTANTS_DOT_H__ */