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586b56b18c
In all top vg read functions only LCK_VG_READ/WRITE can be used. All other vg lock definitions are low-level backend machinery. Moreover, LCK_WRITE cannot be tested through bitmask. This patch fixes these mistakes. For _recover_vg() we do not need lock_flags, it can be only two of above and we always upgrading to LCK_VG_WRITE lock there. (N.B. that code is racy) There is no functional change in code (despite wrong masking it produces correct bits:-)
284 lines
6.5 KiB
C
284 lines
6.5 KiB
C
/*
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* Copyright (C) 2009 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 Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser 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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#include "clvmd-common.h"
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#include <pthread.h>
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#include "locking.h"
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#include "clvm.h"
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#include "clvmd-comms.h"
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#include "lvm-functions.h"
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#include "clvmd.h"
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#include <sys/un.h>
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#include <sys/socket.h>
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#include <fcntl.h>
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static const char SINGLENODE_CLVMD_SOCKNAME[] = DEFAULT_RUN_DIR "/clvmd_singlenode.sock";
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static int listen_fd = -1;
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static void close_comms(void)
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{
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if (listen_fd != -1 && close(listen_fd))
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stack;
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(void)unlink(SINGLENODE_CLVMD_SOCKNAME);
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listen_fd = -1;
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}
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static int init_comms(void)
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{
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struct sockaddr_un addr;
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mode_t old_mask;
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close_comms();
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old_mask = umask(0077);
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listen_fd = socket(PF_UNIX, SOCK_STREAM, 0);
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if (listen_fd < 0) {
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DEBUGLOG("Can't create local socket: %s\n", strerror(errno));
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goto error;
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}
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/* Set Close-on-exec */
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fcntl(listen_fd, F_SETFD, 1);
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memset(&addr, 0, sizeof(addr));
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memcpy(addr.sun_path, SINGLENODE_CLVMD_SOCKNAME,
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sizeof(SINGLENODE_CLVMD_SOCKNAME));
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addr.sun_family = AF_UNIX;
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if (bind(listen_fd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
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DEBUGLOG("Can't bind local socket: %s\n", strerror(errno));
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goto error;
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}
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if (listen(listen_fd, 10) < 0) {
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DEBUGLOG("Can't listen local socket: %s\n", strerror(errno));
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goto error;
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}
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umask(old_mask);
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return 0;
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error:
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umask(old_mask);
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close_comms();
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return -1;
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}
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static int _init_cluster(void)
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{
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int r;
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r = init_comms();
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if (r)
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return r;
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DEBUGLOG("Single-node cluster initialised.\n");
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return 0;
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}
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static void _cluster_closedown(void)
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{
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close_comms();
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DEBUGLOG("cluster_closedown\n");
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destroy_lvhash();
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}
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static void _get_our_csid(char *csid)
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{
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int nodeid = 1;
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memcpy(csid, &nodeid, sizeof(int));
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}
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static int _csid_from_name(char *csid, const char *name)
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{
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return 1;
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}
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static int _name_from_csid(const char *csid, char *name)
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{
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sprintf(name, "SINGLENODE");
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return 0;
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}
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static int _get_num_nodes(void)
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{
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return 1;
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}
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/* Node is now known to be running a clvmd */
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static void _add_up_node(const char *csid)
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{
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}
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/* Call a callback for each node, so the caller knows whether it's up or down */
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static int _cluster_do_node_callback(struct local_client *master_client,
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void (*callback)(struct local_client *,
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const char *csid, int node_up))
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{
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return 0;
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}
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int _lock_file(const char *file, uint32_t flags);
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static int *_locks = NULL;
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static char **_resources = NULL;
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static int _lock_max = 1;
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static pthread_mutex_t _lock_mutex = PTHREAD_MUTEX_INITIALIZER;
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/* Real locking */
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static int _lock_resource(const char *resource, int mode, int flags, int *lockid)
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{
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int *_locks_1;
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char **_resources_1;
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int i, j;
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DEBUGLOG("lock_resource '%s', flags=%d, mode=%d\n",
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resource, flags, mode);
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retry:
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pthread_mutex_lock(&_lock_mutex);
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/* look for an existing lock for this resource */
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for (i = 1; i < _lock_max; ++i) {
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if (!_resources[i])
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break;
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if (!strcmp(_resources[i], resource)) {
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if ((_locks[i] & LCK_TYPE_MASK) == LCK_WRITE ||
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(_locks[i] & LCK_TYPE_MASK) == LCK_EXCL) {
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DEBUGLOG("%s already write/exclusively locked...\n", resource);
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goto maybe_retry;
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}
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if ((mode & LCK_TYPE_MASK) == LCK_WRITE ||
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(mode & LCK_TYPE_MASK) == LCK_EXCL) {
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DEBUGLOG("%s already locked and WRITE/EXCL lock requested...\n",
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resource);
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goto maybe_retry;
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}
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}
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}
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if (i == _lock_max) { /* out of lock slots, extend */
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_locks_1 = dm_realloc(_locks, 2 * _lock_max * sizeof(int));
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if (!_locks_1)
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return 1; /* fail */
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_locks = _locks_1;
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_resources_1 = dm_realloc(_resources, 2 * _lock_max * sizeof(char *));
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if (!_resources_1) {
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/* _locks may get realloc'd twice, but that should be safe */
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return 1; /* fail */
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}
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_resources = _resources_1;
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/* clear the new resource entries */
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for (j = _lock_max; j < 2 * _lock_max; ++j)
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_resources[j] = NULL;
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_lock_max = 2 * _lock_max;
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}
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/* resource is not currently locked, grab it */
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*lockid = i;
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_locks[i] = mode;
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_resources[i] = dm_strdup(resource);
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DEBUGLOG("%s locked -> %d\n", resource, i);
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pthread_mutex_unlock(&_lock_mutex);
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return 0;
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maybe_retry:
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pthread_mutex_unlock(&_lock_mutex);
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if (!(flags & LCK_NONBLOCK)) {
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usleep(10000);
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goto retry;
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}
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return 1; /* fail */
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}
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static int _unlock_resource(const char *resource, int lockid)
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{
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DEBUGLOG("unlock_resource: %s lockid: %x\n", resource, lockid);
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if(!_resources[lockid]) {
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DEBUGLOG("(%s) %d not locked\n", resource, lockid);
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return 1;
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}
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if(strcmp(_resources[lockid], resource)) {
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DEBUGLOG("%d has wrong resource (requested %s, got %s)\n",
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lockid, resource, _resources[lockid]);
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return 1;
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}
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dm_free(_resources[lockid]);
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_resources[lockid] = 0;
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return 0;
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}
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static int _is_quorate(void)
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{
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return 1;
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}
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static int _get_main_cluster_fd(void)
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{
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return listen_fd;
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}
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static int _cluster_fd_callback(struct local_client *fd, char *buf, int len,
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const char *csid,
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struct local_client **new_client)
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{
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return 1;
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}
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static int _cluster_send_message(const void *buf, int msglen,
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const char *csid,
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const char *errtext)
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{
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return 0;
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}
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static int _get_cluster_name(char *buf, int buflen)
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{
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strncpy(buf, "localcluster", buflen);
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buf[buflen - 1] = 0;
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return 0;
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}
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static struct cluster_ops _cluster_singlenode_ops = {
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.cluster_init_completed = NULL,
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.cluster_send_message = _cluster_send_message,
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.name_from_csid = _name_from_csid,
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.csid_from_name = _csid_from_name,
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.get_num_nodes = _get_num_nodes,
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.cluster_fd_callback = _cluster_fd_callback,
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.get_main_cluster_fd = _get_main_cluster_fd,
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.cluster_do_node_callback = _cluster_do_node_callback,
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.is_quorate = _is_quorate,
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.get_our_csid = _get_our_csid,
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.add_up_node = _add_up_node,
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.reread_config = NULL,
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.cluster_closedown = _cluster_closedown,
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.get_cluster_name = _get_cluster_name,
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.sync_lock = _lock_resource,
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.sync_unlock = _unlock_resource,
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};
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struct cluster_ops *init_singlenode_cluster(void)
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{
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if (!_init_cluster())
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return &_cluster_singlenode_ops;
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else
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return NULL;
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}
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