diff options
Diffstat (limited to 'net/tipc/node.c')
| -rw-r--r-- | net/tipc/node.c | 55 |
1 files changed, 50 insertions, 5 deletions
diff --git a/net/tipc/node.c b/net/tipc/node.c index 598f4d3a009..ee952ad6021 100644 --- a/net/tipc/node.c +++ b/net/tipc/node.c @@ -52,16 +52,40 @@ static void node_established_contact(struct node *n_ptr); struct node *tipc_nodes = NULL; /* sorted list of nodes within cluster */ +static DEFINE_SPINLOCK(node_create_lock); + u32 tipc_own_tag = 0; +/** + * tipc_node_create - create neighboring node + * + * Currently, this routine is called by neighbor discovery code, which holds + * net_lock for reading only. We must take node_create_lock to ensure a node + * isn't created twice if two different bearers discover the node at the same + * time. (It would be preferable to switch to holding net_lock in write mode, + * but this is a non-trivial change.) + */ + struct node *tipc_node_create(u32 addr) { struct cluster *c_ptr; struct node *n_ptr; struct node **curr_node; + spin_lock_bh(&node_create_lock); + + for (n_ptr = tipc_nodes; n_ptr; n_ptr = n_ptr->next) { + if (addr < n_ptr->addr) + break; + if (addr == n_ptr->addr) { + spin_unlock_bh(&node_create_lock); + return n_ptr; + } + } + n_ptr = kzalloc(sizeof(*n_ptr),GFP_ATOMIC); if (!n_ptr) { + spin_unlock_bh(&node_create_lock); warn("Node creation failed, no memory\n"); return NULL; } @@ -71,6 +95,7 @@ struct node *tipc_node_create(u32 addr) c_ptr = tipc_cltr_create(addr); } if (!c_ptr) { + spin_unlock_bh(&node_create_lock); kfree(n_ptr); return NULL; } @@ -91,6 +116,7 @@ struct node *tipc_node_create(u32 addr) } } (*curr_node) = n_ptr; + spin_unlock_bh(&node_create_lock); return n_ptr; } @@ -574,12 +600,14 @@ u32 tipc_available_nodes(const u32 domain) struct node *n_ptr; u32 cnt = 0; + read_lock_bh(&tipc_net_lock); for (n_ptr = tipc_nodes; n_ptr; n_ptr = n_ptr->next) { if (!in_scope(domain, n_ptr->addr)) continue; if (tipc_node_is_up(n_ptr)) cnt++; } + read_unlock_bh(&tipc_net_lock); return cnt; } @@ -599,19 +627,26 @@ struct sk_buff *tipc_node_get_nodes(const void *req_tlv_area, int req_tlv_space) return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE " (network address)"); - if (!tipc_nodes) + read_lock_bh(&tipc_net_lock); + if (!tipc_nodes) { + read_unlock_bh(&tipc_net_lock); return tipc_cfg_reply_none(); + } /* For now, get space for all other nodes (will need to modify this when slave nodes are supported */ payload_size = TLV_SPACE(sizeof(node_info)) * (tipc_max_nodes - 1); - if (payload_size > 32768u) + if (payload_size > 32768u) { + read_unlock_bh(&tipc_net_lock); return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED " (too many nodes)"); + } buf = tipc_cfg_reply_alloc(payload_size); - if (!buf) + if (!buf) { + read_unlock_bh(&tipc_net_lock); return NULL; + } /* Add TLVs for all nodes in scope */ @@ -624,6 +659,7 @@ struct sk_buff *tipc_node_get_nodes(const void *req_tlv_area, int req_tlv_space) &node_info, sizeof(node_info)); } + read_unlock_bh(&tipc_net_lock); return buf; } @@ -646,16 +682,22 @@ struct sk_buff *tipc_node_get_links(const void *req_tlv_area, int req_tlv_space) if (tipc_mode != TIPC_NET_MODE) return tipc_cfg_reply_none(); + read_lock_bh(&tipc_net_lock); + /* Get space for all unicast links + multicast link */ payload_size = TLV_SPACE(sizeof(link_info)) * (tipc_net.zones[tipc_zone(tipc_own_addr)]->links + 1); - if (payload_size > 32768u) + if (payload_size > 32768u) { + read_unlock_bh(&tipc_net_lock); return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED " (too many links)"); + } buf = tipc_cfg_reply_alloc(payload_size); - if (!buf) + if (!buf) { + read_unlock_bh(&tipc_net_lock); return NULL; + } /* Add TLV for broadcast link */ @@ -671,6 +713,7 @@ struct sk_buff *tipc_node_get_links(const void *req_tlv_area, int req_tlv_space) if (!in_scope(domain, n_ptr->addr)) continue; + tipc_node_lock(n_ptr); for (i = 0; i < MAX_BEARERS; i++) { if (!n_ptr->links[i]) continue; @@ -680,7 +723,9 @@ struct sk_buff *tipc_node_get_links(const void *req_tlv_area, int req_tlv_space) tipc_cfg_append_tlv(buf, TIPC_TLV_LINK_INFO, &link_info, sizeof(link_info)); } + tipc_node_unlock(n_ptr); } + read_unlock_bh(&tipc_net_lock); return buf; } |