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