daemons/controld/controld

/* */
This source file includes following definitions.
crmd_cs_dispatch
crmd_quorum_callback
crmd_cs_destroy
cpg_membership_callback
crm_connect_corosync
   1 /*
   2  * Copyright 2004-2024 the Pacemaker project contributors
   3  *
   4  * The version control history for this file may have further details.
   5  *
   6  * This source code is licensed under the GNU General Public License version 2
   7  * or later (GPLv2+) WITHOUT ANY WARRANTY.
   8  */
   9 
  10 #include <crm_internal.h>
  11 
  12 #include <sys/param.h>
  13 #include <sys/types.h>
  14 #include <sys/stat.h>
  15 
  16 #include <crm/crm.h>
  17 #include <crm/cluster/internal.h>
  18 #include <crm/common/xml.h>
  19 
  20 #include <pacemaker-controld.h>
  21 
  22 #if SUPPORT_COROSYNC
  23 
  24 extern void post_cache_update(int seq);
  25 
  26 /*       A_HA_CONNECT   */
  27 
  28 static void
  29 crmd_cs_dispatch(cpg_handle_t handle, const struct cpg_name *groupName,
     /*  */
  30                  uint32_t nodeid, uint32_t pid, void *msg, size_t msg_len)
  31 {
  32     uint32_t kind = 0;
  33     const char *from = NULL;
  34     char *data = pcmk__cpg_message_data(handle, nodeid, pid, msg, &kind, &from);
  35 
  36     if(data == NULL) {
  37         return;
  38     }
  39     if (kind == crm_class_cluster) {
  40         crm_node_t *peer = NULL;
  41         xmlNode *xml = pcmk__xml_parse(data);
  42 
  43         if (xml == NULL) {
  44             crm_err("Could not parse message content (%d): %.100s", kind, data);
  45             free(data);
  46             return;
  47         }
  48 
  49         crm_xml_add(xml, PCMK__XA_SRC, from);
  50 
  51         peer = pcmk__get_node(0, from, NULL, pcmk__node_search_cluster_member);
  52         if (!pcmk_is_set(peer->processes, crm_proc_cpg)) {
  53             /* If we can still talk to our peer process on that node,
  54              * then it must be part of the corosync membership
  55              */
  56             crm_warn("Receiving messages from a node we think is dead: %s[%d]",
  57                      peer->uname, peer->id);
  58             crm_update_peer_proc(__func__, peer, crm_proc_cpg,
  59                                  PCMK_VALUE_ONLINE);
  60         }
  61         crmd_ha_msg_filter(xml);
  62         free_xml(xml);
  63     } else {
  64         crm_err("Invalid message class (%d): %.100s", kind, data);
  65     }
  66     free(data);
  67 }
  68 
  69 static gboolean
  70 crmd_quorum_callback(unsigned long long seq, gboolean quorate)
     /*  */
  71 {
  72     crm_update_quorum(quorate, FALSE);
  73     post_cache_update(seq);
  74     return TRUE;
  75 }
  76 
  77 static void
  78 crmd_cs_destroy(gpointer user_data)
     /*  */
  79 {
  80     if (!pcmk_is_set(controld_globals.fsa_input_register, R_HA_DISCONNECTED)) {
  81         crm_crit("Lost connection to cluster layer, shutting down");
  82         crmd_exit(CRM_EX_DISCONNECT);
  83     }
  84 }
  85 
  86 /*!
  87  * \brief Handle a Corosync notification of a CPG configuration change
  88  *
  89  * \param[in] handle               CPG connection
  90  * \param[in] cpg_name             CPG group name
  91  * \param[in] member_list          List of current CPG members
  92  * \param[in] member_list_entries  Number of entries in \p member_list
  93  * \param[in] left_list            List of CPG members that left
  94  * \param[in] left_list_entries    Number of entries in \p left_list
  95  * \param[in] joined_list          List of CPG members that joined
  96  * \param[in] joined_list_entries  Number of entries in \p joined_list
  97  */
  98 static void
  99 cpg_membership_callback(cpg_handle_t handle, const struct cpg_name *cpg_name,
     /*  */
 100                         const struct cpg_address *member_list,
 101                         size_t member_list_entries,
 102                         const struct cpg_address *left_list,
 103                         size_t left_list_entries,
 104                         const struct cpg_address *joined_list,
 105                         size_t joined_list_entries)
 106 {
 107     /* When nodes leave CPG, the DC clears their transient node attributes.
 108      *
 109      * However if there is no DC, or the DC is among the nodes that left, each
 110      * remaining node needs to do the clearing, to ensure it gets done.
 111      * Otherwise, the attributes would persist when the nodes rejoin, which
 112      * could have serious consequences for unfencing, agents that use attributes
 113      * for internal logic, etc.
 114      *
 115      * Here, we set a global boolean if the DC is among the nodes that left, for
 116      * use by the peer callback.
 117      */
 118     if (controld_globals.dc_name != NULL) {
 119         crm_node_t *peer = NULL;
 120 
 121         peer = pcmk__search_node_caches(0, controld_globals.dc_name,
 122                                         pcmk__node_search_cluster_member);
 123         if (peer != NULL) {
 124             for (int i = 0; i < left_list_entries; ++i) {
 125                 if (left_list[i].nodeid == peer->id) {
 126                     controld_set_global_flags(controld_dc_left);
 127                     break;
 128                 }
 129             }
 130         }
 131     }
 132 
 133     // Process the change normally, which will call the peer callback as needed
 134     pcmk__cpg_confchg_cb(handle, cpg_name, member_list, member_list_entries,
 135                          left_list, left_list_entries,
 136                          joined_list, joined_list_entries);
 137 
 138     controld_clear_global_flags(controld_dc_left);
 139 }
 140 
 141 extern gboolean crm_connect_corosync(pcmk_cluster_t *cluster);
 142 
 143 gboolean
 144 crm_connect_corosync(pcmk_cluster_t *cluster)
     /*  */
 145 {
 146     if (pcmk_get_cluster_layer() == pcmk_cluster_layer_corosync) {
 147         pcmk__cluster_set_status_callback(&peer_update_callback);
 148 
 149         pcmk_cluster_set_destroy_fn(cluster, crmd_cs_destroy);
 150         pcmk_cpg_set_deliver_fn(cluster, crmd_cs_dispatch);
 151         pcmk_cpg_set_confchg_fn(cluster, cpg_membership_callback);
 152 
 153         if (pcmk_cluster_connect(cluster) == pcmk_rc_ok) {
 154             pcmk__corosync_quorum_connect(crmd_quorum_callback,
 155                                           crmd_cs_destroy);
 156             return TRUE;
 157         }
 158     }
 159     return FALSE;
 160 }
 161 
 162 #endif
/* */
root/daemons/controld/controld_corosync.c

DEFINITIONS
