linux-headers (unknown)
1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 /******************************************************************************
3 *******************************************************************************
4 **
5 ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
6 ** Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
7 **
8 ** This copyrighted material is made available to anyone wishing to use,
9 ** modify, copy, or redistribute it subject to the terms and conditions
10 ** of the GNU General Public License v.2.
11 **
12 *******************************************************************************
13 ******************************************************************************/
14
15 #ifndef __DLMCONSTANTS_DOT_H__
16 #define __DLMCONSTANTS_DOT_H__
17
18 /*
19 * Constants used by DLM interface.
20 */
21
22 #define DLM_LOCKSPACE_LEN 64
23 #define DLM_RESNAME_MAXLEN 64
24
25
26 /*
27 * Lock Modes
28 */
29
30 #define DLM_LOCK_IV (-1) /* invalid */
31 #define DLM_LOCK_NL 0 /* null */
32 #define DLM_LOCK_CR 1 /* concurrent read */
33 #define DLM_LOCK_CW 2 /* concurrent write */
34 #define DLM_LOCK_PR 3 /* protected read */
35 #define DLM_LOCK_PW 4 /* protected write */
36 #define DLM_LOCK_EX 5 /* exclusive */
37
38
39 /*
40 * Flags to dlm_lock
41 *
42 * DLM_LKF_NOQUEUE
43 *
44 * Do not queue the lock request on the wait queue if it cannot be granted
45 * immediately. If the lock cannot be granted because of this flag, DLM will
46 * either return -EAGAIN from the dlm_lock call or will return 0 from
47 * dlm_lock and -EAGAIN in the lock status block when the AST is executed.
48 *
49 * DLM_LKF_CANCEL
50 *
51 * Used to cancel a pending lock request or conversion. A converting lock is
52 * returned to its previously granted mode.
53 *
54 * DLM_LKF_CONVERT
55 *
56 * Indicates a lock conversion request. For conversions the name and namelen
57 * are ignored and the lock ID in the LKSB is used to identify the lock.
58 *
59 * DLM_LKF_VALBLK
60 *
61 * Requests DLM to return the current contents of the lock value block in the
62 * lock status block. When this flag is set in a lock conversion from PW or EX
63 * modes, DLM assigns the value specified in the lock status block to the lock
64 * value block of the lock resource. The LVB is a DLM_LVB_LEN size array
65 * containing application-specific information.
66 *
67 * DLM_LKF_QUECVT
68 *
69 * Force a conversion request to be queued, even if it is compatible with
70 * the granted modes of other locks on the same resource.
71 *
72 * DLM_LKF_IVVALBLK
73 *
74 * Invalidate the lock value block.
75 *
76 * DLM_LKF_CONVDEADLK
77 *
78 * Allows the dlm to resolve conversion deadlocks internally by demoting the
79 * granted mode of a converting lock to NL. The DLM_SBF_DEMOTED flag is
80 * returned for a conversion that's been effected by this.
81 *
82 * DLM_LKF_PERSISTENT
83 *
84 * Only relevant to locks originating in userspace. A persistent lock will not
85 * be removed if the process holding the lock exits.
86 *
87 * DLM_LKF_NODLCKWT
88 *
89 * Do not cancel the lock if it gets into conversion deadlock.
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 *
117 * Acquire an orphan lock.
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 * DLM_LKF_TIMEOUT
135 *
136 * This value is deprecated and reserved. DO NOT USE!
137 *
138 */
139
140 #define DLM_LKF_NOQUEUE 0x00000001
141 #define DLM_LKF_CANCEL 0x00000002
142 #define DLM_LKF_CONVERT 0x00000004
143 #define DLM_LKF_VALBLK 0x00000008
144 #define DLM_LKF_QUECVT 0x00000010
145 #define DLM_LKF_IVVALBLK 0x00000020
146 #define DLM_LKF_CONVDEADLK 0x00000040
147 #define DLM_LKF_PERSISTENT 0x00000080
148 #define DLM_LKF_NODLCKWT 0x00000100
149 #define DLM_LKF_NODLCKBLK 0x00000200
150 #define DLM_LKF_EXPEDITE 0x00000400
151 #define DLM_LKF_NOQUEUEBAST 0x00000800
152 #define DLM_LKF_HEADQUE 0x00001000
153 #define DLM_LKF_NOORDER 0x00002000
154 #define DLM_LKF_ORPHAN 0x00004000
155 #define DLM_LKF_ALTPR 0x00008000
156 #define DLM_LKF_ALTCW 0x00010000
157 #define DLM_LKF_FORCEUNLOCK 0x00020000
158 #define DLM_LKF_TIMEOUT 0x00040000
159
160 /*
161 * Some return codes that are not in errno.h
162 */
163
164 #define DLM_ECANCEL 0x10001
165 #define DLM_EUNLOCK 0x10002
166
167 #endif /* __DLMCONSTANTS_DOT_H__ */
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