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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 conditions10** 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 6423#define DLM_RESNAME_MAXLEN 6424 25 26/*27 * Lock Modes28 */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_lock41 *42 * DLM_LKF_NOQUEUE43 *44 * Do not queue the lock request on the wait queue if it cannot be granted45 * immediately. If the lock cannot be granted because of this flag, DLM will46 * either return -EAGAIN from the dlm_lock call or will return 0 from47 * dlm_lock and -EAGAIN in the lock status block when the AST is executed.48 *49 * DLM_LKF_CANCEL50 *51 * Used to cancel a pending lock request or conversion. A converting lock is52 * returned to its previously granted mode.53 *54 * DLM_LKF_CONVERT55 *56 * Indicates a lock conversion request. For conversions the name and namelen57 * are ignored and the lock ID in the LKSB is used to identify the lock.58 *59 * DLM_LKF_VALBLK60 *61 * Requests DLM to return the current contents of the lock value block in the62 * lock status block. When this flag is set in a lock conversion from PW or EX63 * modes, DLM assigns the value specified in the lock status block to the lock64 * value block of the lock resource. The LVB is a DLM_LVB_LEN size array65 * containing application-specific information.66 *67 * DLM_LKF_QUECVT68 *69 * Force a conversion request to be queued, even if it is compatible with70 * the granted modes of other locks on the same resource.71 *72 * DLM_LKF_IVVALBLK73 *74 * Invalidate the lock value block.75 *76 * DLM_LKF_CONVDEADLK77 *78 * Allows the dlm to resolve conversion deadlocks internally by demoting the79 * granted mode of a converting lock to NL. The DLM_SBF_DEMOTED flag is80 * returned for a conversion that's been effected by this.81 *82 * DLM_LKF_PERSISTENT83 *84 * Only relevant to locks originating in userspace. A persistent lock will not85 * be removed if the process holding the lock exits.86 *87 * DLM_LKF_NODLCKWT88 *89 * Do not cancel the lock if it gets into conversion deadlock.90 *91 * DLM_LKF_NODLCKBLK92 *93 * net yet implemented94 *95 * DLM_LKF_EXPEDITE96 *97 * Used only with new requests for NL mode locks. Tells the lock manager98 * to grant the lock, ignoring other locks in convert and wait queues.99 *100 * DLM_LKF_NOQUEUEBAST101 *102 * Send blocking AST's before returning -EAGAIN to the caller. It is only103 * used along with the NOQUEUE flag. Blocking AST's are not sent for failed104 * NOQUEUE requests otherwise.105 *106 * DLM_LKF_HEADQUE107 *108 * Add a lock to the head of the convert or wait queue rather than the tail.109 *110 * DLM_LKF_NOORDER111 *112 * Disregard the standard grant order rules and grant a lock as soon as it113 * is compatible with other granted locks.114 *115 * DLM_LKF_ORPHAN116 *117 * Acquire an orphan lock.118 *119 * DLM_LKF_ALTPR120 *121 * If the requested mode cannot be granted immediately, try to grant the lock122 * in PR mode instead. If this alternate mode is granted instead of the123 * requested mode, DLM_SBF_ALTMODE is returned in the lksb.124 *125 * DLM_LKF_ALTCW126 *127 * The same as ALTPR, but the alternate mode is CW.128 *129 * DLM_LKF_FORCEUNLOCK130 *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_TIMEOUT135 *136 * This value is deprecated and reserved. DO NOT USE!137 *138 */139 140#define DLM_LKF_NOQUEUE 0x00000001141#define DLM_LKF_CANCEL 0x00000002142#define DLM_LKF_CONVERT 0x00000004143#define DLM_LKF_VALBLK 0x00000008144#define DLM_LKF_QUECVT 0x00000010145#define DLM_LKF_IVVALBLK 0x00000020146#define DLM_LKF_CONVDEADLK 0x00000040147#define DLM_LKF_PERSISTENT 0x00000080148#define DLM_LKF_NODLCKWT 0x00000100149#define DLM_LKF_NODLCKBLK 0x00000200150#define DLM_LKF_EXPEDITE 0x00000400151#define DLM_LKF_NOQUEUEBAST 0x00000800152#define DLM_LKF_HEADQUE 0x00001000153#define DLM_LKF_NOORDER 0x00002000154#define DLM_LKF_ORPHAN 0x00004000155#define DLM_LKF_ALTPR 0x00008000156#define DLM_LKF_ALTCW 0x00010000157#define DLM_LKF_FORCEUNLOCK 0x00020000158#define DLM_LKF_TIMEOUT 0x00040000159 160/*161 * Some return codes that are not in errno.h162 */163 164#define DLM_ECANCEL 0x10001165#define DLM_EUNLOCK 0x10002166 167#endif /* __DLMCONSTANTS_DOT_H__ */168