include/uapi/linux/dlmconstants.h

   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  * Exclude this lock from being monitored due to DLM_LSFL_TIMEWARN.
  91  *
  92  * DLM_LKF_NODLCKBLK
  93  *
  94  * net yet implemented
  95  *
  96  * DLM_LKF_EXPEDITE
  97  *
  98  * Used only with new requests for NL mode locks.  Tells the lock manager
  99  * to grant the lock, ignoring other locks in convert and wait queues.
 100  *
 101  * DLM_LKF_NOQUEUEBAST
 102  *
 103  * Send blocking AST's before returning -EAGAIN to the caller.  It is only
 104  * used along with the NOQUEUE flag.  Blocking AST's are not sent for failed
 105  * NOQUEUE requests otherwise.
 106  *
 107  * DLM_LKF_HEADQUE
 108  *
 109  * Add a lock to the head of the convert or wait queue rather than the tail.
 110  *
 111  * DLM_LKF_NOORDER
 112  *
 113  * Disregard the standard grant order rules and grant a lock as soon as it
 114  * is compatible with other granted locks.
 115  *
 116  * DLM_LKF_ORPHAN
 117  *
 118  * Acquire an orphan lock.
 119  *
 120  * DLM_LKF_ALTPR
 121  *
 122  * If the requested mode cannot be granted immediately, try to grant the lock
 123  * in PR mode instead.  If this alternate mode is granted instead of the
 124  * requested mode, DLM_SBF_ALTMODE is returned in the lksb.
 125  *
 126  * DLM_LKF_ALTCW
 127  *
 128  * The same as ALTPR, but the alternate mode is CW.
 129  *
 130  * DLM_LKF_FORCEUNLOCK
 131  *
 132  * Unlock the lock even if it is converting or waiting or has sublocks.
 133  * Only really for use by the userland device.c code.
 134  *
 135  */
 136
 137 #define DLM_LKF_NOQUEUE         0x00000001
 138 #define DLM_LKF_CANCEL          0x00000002
 139 #define DLM_LKF_CONVERT         0x00000004
 140 #define DLM_LKF_VALBLK          0x00000008
 141 #define DLM_LKF_QUECVT          0x00000010
 142 #define DLM_LKF_IVVALBLK        0x00000020
 143 #define DLM_LKF_CONVDEADLK      0x00000040
 144 #define DLM_LKF_PERSISTENT      0x00000080
 145 #define DLM_LKF_NODLCKWT        0x00000100
 146 #define DLM_LKF_NODLCKBLK       0x00000200
 147 #define DLM_LKF_EXPEDITE        0x00000400
 148 #define DLM_LKF_NOQUEUEBAST     0x00000800
 149 #define DLM_LKF_HEADQUE         0x00001000
 150 #define DLM_LKF_NOORDER         0x00002000
 151 #define DLM_LKF_ORPHAN          0x00004000
 152 #define DLM_LKF_ALTPR           0x00008000
 153 #define DLM_LKF_ALTCW           0x00010000
 154 #define DLM_LKF_FORCEUNLOCK     0x00020000
 155 #define DLM_LKF_TIMEOUT         0x00040000
 156
 157 /*
 158  * Some return codes that are not in errno.h
 159  */
 160
 161 #define DLM_ECANCEL             0x10001
 162 #define DLM_EUNLOCK             0x10002
 163
 164 #endif  /* __DLMCONSTANTS_DOT_H__ */