drbd: get_one_status(): Iterate over resource->devices instead of connection->peer_devices
Signed-off-by: Andreas Gruenbacher <agruen@linbit.com>
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 81e07e26..6f11d85 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -2752,23 +2752,28 @@
return drbd_adm_simple_request_state(skb, info, NS(disk, D_OUTDATED));
}
-static int nla_put_drbd_cfg_context(struct sk_buff *skb, struct drbd_connection *connection, unsigned vnr)
+static int nla_put_drbd_cfg_context(struct sk_buff *skb,
+ struct drbd_resource *resource,
+ struct drbd_connection *connection,
+ struct drbd_device *device)
{
struct nlattr *nla;
nla = nla_nest_start(skb, DRBD_NLA_CFG_CONTEXT);
if (!nla)
goto nla_put_failure;
- if (vnr != VOLUME_UNSPECIFIED &&
- nla_put_u32(skb, T_ctx_volume, vnr))
+ if (device &&
+ nla_put_u32(skb, T_ctx_volume, device->vnr))
goto nla_put_failure;
if (nla_put_string(skb, T_ctx_resource_name, connection->resource->name))
goto nla_put_failure;
- if (connection->my_addr_len &&
- nla_put(skb, T_ctx_my_addr, connection->my_addr_len, &connection->my_addr))
- goto nla_put_failure;
- if (connection->peer_addr_len &&
- nla_put(skb, T_ctx_peer_addr, connection->peer_addr_len, &connection->peer_addr))
- goto nla_put_failure;
+ if (connection) {
+ if (connection->my_addr_len &&
+ nla_put(skb, T_ctx_my_addr, connection->my_addr_len, &connection->my_addr))
+ goto nla_put_failure;
+ if (connection->peer_addr_len &&
+ nla_put(skb, T_ctx_peer_addr, connection->peer_addr_len, &connection->peer_addr))
+ goto nla_put_failure;
+ }
nla_nest_end(skb, nla);
return 0;
@@ -2778,9 +2783,22 @@
return -EMSGSIZE;
}
-static int nla_put_status_info(struct sk_buff *skb, struct drbd_device *device,
+/*
+ * Return the connection of @resource if @resource has exactly one connection.
+ */
+static struct drbd_connection *the_only_connection(struct drbd_resource *resource)
+{
+ struct list_head *connections = &resource->connections;
+
+ if (list_empty(connections) || connections->next->next != connections)
+ return NULL;
+ return list_first_entry(&resource->connections, struct drbd_connection, connections);
+}
+
+int nla_put_status_info(struct sk_buff *skb, struct drbd_device *device,
const struct sib_info *sib)
{
+ struct drbd_resource *resource = device->resource;
struct state_info *si = NULL; /* for sizeof(si->member); */
struct nlattr *nla;
int got_ldev;
@@ -2804,7 +2822,7 @@
/* We need to add connection name and volume number information still.
* Minor number is in drbd_genlmsghdr. */
- if (nla_put_drbd_cfg_context(skb, first_peer_device(device)->connection, device->vnr))
+ if (nla_put_drbd_cfg_context(skb, resource, the_only_connection(resource), device))
goto nla_put_failure;
if (res_opts_to_skb(skb, &device->resource->res_opts, exclude_sensitive))
@@ -2922,19 +2940,17 @@
static int get_one_status(struct sk_buff *skb, struct netlink_callback *cb)
{
- struct drbd_peer_device *peer_device;
struct drbd_device *device;
struct drbd_genlmsghdr *dh;
struct drbd_resource *pos = (struct drbd_resource *)cb->args[0];
struct drbd_resource *resource = NULL;
- struct drbd_connection *connection;
struct drbd_resource *tmp;
unsigned volume = cb->args[1];
/* Open coded, deferred, iteration:
* for_each_resource_safe(resource, tmp, &drbd_resources) {
- * connection = "first connection of resource";
- * idr_for_each_entry(&connection->peer_devices, peer_device, i) {
+ * connection = "first connection of resource or undefined";
+ * idr_for_each_entry(&resource->devices, device, i) {
* ...
* }
* }
@@ -2969,9 +2985,8 @@
}
if (resource) {
next_resource:
- connection = first_connection(resource);
- peer_device = idr_get_next(&connection->peer_devices, &volume);
- if (!peer_device) {
+ device = idr_get_next(&resource->devices, &volume);
+ if (!device) {
/* No more volumes to dump on this resource.
* Advance resource iterator. */
pos = list_entry_rcu(resource->resources.next,
@@ -2995,24 +3010,29 @@
if (!dh)
goto out;
- if (!peer_device) {
+ if (!device) {
/* This is a connection without a single volume.
* Suprisingly enough, it may have a network
* configuration. */
- struct net_conf *nc;
+ struct drbd_connection *connection;
+
dh->minor = -1U;
dh->ret_code = NO_ERROR;
- if (nla_put_drbd_cfg_context(skb, connection, VOLUME_UNSPECIFIED))
+ connection = the_only_connection(resource);
+ if (nla_put_drbd_cfg_context(skb, resource, connection, NULL))
goto cancel;
- nc = rcu_dereference(connection->net_conf);
- if (nc && net_conf_to_skb(skb, nc, 1) != 0)
- goto cancel;
+ if (connection) {
+ struct net_conf *nc;
+
+ nc = rcu_dereference(connection->net_conf);
+ if (nc && net_conf_to_skb(skb, nc, 1) != 0)
+ goto cancel;
+ }
goto done;
}
- device = peer_device->device;
D_ASSERT(device, device->vnr == volume);
- D_ASSERT(device, first_peer_device(device)->connection == connection);
+ D_ASSERT(device, device->resource == resource);
dh->minor = device_to_minor(device);
dh->ret_code = NO_ERROR;
