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
