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fa6dca9f28
Current code, when need to ensure that volume is not active on remote node, it need to try to exclusive activate volume. Patch adds simple clvmd command which queries all nodes for lock for given resource. The lock type is returned in reply in text. (But code currently uses CR and EX modes only.)
73 lines
2.5 KiB
C
73 lines
2.5 KiB
C
/*
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* Copyright (C) 2002-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* Definitions for CLVMD server and clients */
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/*
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* The protocol spoken over the cluster and across the local socket.
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*/
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#ifndef _CLVM_H
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#define _CLVM_H
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struct clvm_header {
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uint8_t cmd; /* See below */
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uint8_t flags; /* See below */
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uint16_t xid; /* Transaction ID */
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uint32_t clientid; /* Only used in Daemon->Daemon comms */
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int32_t status; /* For replies, whether request succeeded */
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uint32_t arglen; /* Length of argument below.
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If >1500 then it will be passed
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around the cluster in the system LV */
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char node[1]; /* Actually a NUL-terminated string, node name.
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If this is empty then the command is
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forwarded to all cluster nodes unless
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FLAG_LOCAL is also set. */
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char args[1]; /* Arguments for the command follow the
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node name, This member is only
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valid if the node name is empty */
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} __attribute__ ((packed));
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/* Flags */
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#define CLVMD_FLAG_LOCAL 1 /* Only do this on the local node */
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#define CLVMD_FLAG_SYSTEMLV 2 /* Data in system LV under my node name */
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#define CLVMD_FLAG_NODEERRS 4 /* Reply has errors in node-specific portion */
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/* Name of the local socket to communicate between libclvm and clvmd */
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//static const char CLVMD_SOCKNAME[]="/var/run/clvmd";
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static const char CLVMD_SOCKNAME[] = "\0clvmd";
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/* Internal commands & replies */
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#define CLVMD_CMD_REPLY 1
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#define CLVMD_CMD_VERSION 2 /* Send version around cluster when we start */
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#define CLVMD_CMD_GOAWAY 3 /* Die if received this - we are running
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an incompatible version */
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#define CLVMD_CMD_TEST 4 /* Just for mucking about */
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#define CLVMD_CMD_LOCK 30
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#define CLVMD_CMD_UNLOCK 31
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/* Lock/Unlock commands */
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#define CLVMD_CMD_LOCK_LV 50
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#define CLVMD_CMD_LOCK_VG 51
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#define CLVMD_CMD_LOCK_QUERY 52
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/* Misc functions */
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#define CLVMD_CMD_REFRESH 40
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#define CLVMD_CMD_GET_CLUSTERNAME 41
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#define CLVMD_CMD_SET_DEBUG 42
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#define CLVMD_CMD_VG_BACKUP 43
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#endif
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