LU-8287 nodemap: don't stop config lock when target stops

[fs/lustre-release.git] / lustre / ptlrpc / nodemap_handler.c

diff --git a/lustre/ptlrpc/nodemap_handler.c b/lustre/ptlrpc/nodemap_handler.c
index e80247a..2086246 100644 (file)
--- a/lustre/ptlrpc/nodemap_handler.c
+++ b/lustre/ptlrpc/nodemap_handler.c
@@ -777,15 +777,21 @@ int nodemap_add_range_helper(struct nodemap_config *config,
        }
 
        list_add(&range->rn_list, &nodemap->nm_ranges);
-       nm_member_reclassify_nodemap(config->nmc_default_nodemap);
+
+       /* nodemaps have no members if they aren't on the active config */
+       if (config == active_config)
+               nm_member_reclassify_nodemap(config->nmc_default_nodemap);
+
        up_write(&config->nmc_range_tree_lock);
 
        /* if range_id is non-zero, we are loading from disk */
        if (range_id == 0)
                rc = nodemap_idx_range_add(range, nid);
 
-       nm_member_revoke_locks(config->nmc_default_nodemap);
-       nm_member_revoke_locks(nodemap);
+       if (config == active_config) {
+               nm_member_revoke_locks(config->nmc_default_nodemap);
+               nm_member_revoke_locks(nodemap);
+       }
 
 out:
        return rc;
@@ -1375,15 +1381,18 @@ void nodemap_config_dealloc(struct nodemap_config *config)
         */
        list_for_each_entry_safe(nodemap, nodemap_temp, &nodemap_list_head,
                                 nm_list) {
+               mutex_lock(&active_config_lock);
                down_write(&config->nmc_range_tree_lock);
 
-               /* move members to new config */
+               /* move members to new config, requires ac lock */
                nm_member_reclassify_nodemap(nodemap);
                list_for_each_entry_safe(range, range_temp, &nodemap->nm_ranges,
                                         rn_list)
                        range_delete(&config->nmc_range_tree, range);
                up_write(&config->nmc_range_tree_lock);
+               mutex_unlock(&active_config_lock);
 
+               /* putref must be outside of ac lock if nm could be destroyed */
                nodemap_putref(nodemap);
        }
        OBD_FREE_PTR(config);
@@ -1406,6 +1415,7 @@ void nodemap_config_set_active(struct nodemap_config *config)
        struct nodemap_config   *old_config = active_config;
        struct lu_nodemap       *nodemap;
        struct lu_nodemap       *tmp;
+       bool revoke_locks;
        LIST_HEAD(nodemap_list_head);
 
        ENTRY;
@@ -1436,6 +1446,14 @@ void nodemap_config_set_active(struct nodemap_config *config)
                }
        }
 
+       /*
+        * We only need to revoke locks if old nodemap was active, and new
+        * config is now nodemap inactive. nodemap_config_dealloc will
+        * reclassify exports, triggering a lock revoke if and only if new
+        * nodemap is active.
+        */
+       revoke_locks = !config->nmc_nodemap_is_active && nodemap_active;
+
        /* if new config is inactive, deactivate live config before switching */
        if (!config->nmc_nodemap_is_active)
                nodemap_active = false;
@@ -1448,7 +1466,8 @@ void nodemap_config_set_active(struct nodemap_config *config)
        if (old_config != NULL)
                nodemap_config_dealloc(old_config);
 
-       nm_member_revoke_all();
+       if (revoke_locks)
+               nm_member_revoke_all();
 
        EXIT;
 }
@@ -1510,7 +1529,7 @@ void nm_member_revoke_all(void)
 
        /* revoke_locks sleeps, so can't call in cfs hash cb */
        list_for_each_entry_safe(nodemap, tmp, &nodemap_list_head, nm_list)
-               nm_member_revoke_locks(nodemap);
+               nm_member_revoke_locks_always(nodemap);
        mutex_unlock(&active_config_lock);
 }