linux/include/linux/dlmconstants.h
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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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