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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 | #define DLM_LOCKSPACE_LEN 64 |
22 | #define DLM_RESNAME_MAXLEN 64 |
23 | |
24 | |
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 | * |
117 | * not yet implemented |
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__ */ |
164 |
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